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Recent questions and answers in Moving Charges and Magentism
Questions
>>
JEEMAIN and NEET
>>
Physics
>>
Class12
>>
Moving Charges and Magentism
A particle is projected perpendicular to a uniform magnetic field. The area bounded by the trajectory of the particle is directly proportional to
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-magnetism
motion-in-a-magnetic-field
easy
answered
Jun 2, 2018
by
kasirnazir620
2
answers
A current carrying square loop is placed near an infinitely long current carrying wire. The torque acting on the loop is
jeemain
physics
class12-ch4
moving-charges-and-magnetism
force-between-two-parallel-currents
medium
answered
Mar 27, 2014
by
meena.p
1
answer
A current caring wire AB is placed near another long current carrying wire CD. If free to move AB will have D.
jeemain
physics
class12
ch4
moving-charge-and-magnetism
biot-savart-law
easy
answered
Mar 27, 2014
by
meena.p
1
answer
A beam of electrons travels at
3
×
10
6
m
/
s
through a uniform magnetic field of
4
×
10
−
2
T
at right angles to the field, as shown in the figure. How strong is the force acting on each electron?
jeemain
physics
moving-charge-and-magnetism
magnetic-field-in-the-axis-of
current-in-a-circular-loop
easy
answered
Mar 14, 2014
by
balaji.thirumalai
1
answer
Find the magnetic field at point P in the figure below, where I = 15 A and R = 20 cm.
jeemain
physics
class12
ch4
moving-charge-and-magnetism
magnetic-field-on-axis-current-circular-loop
medium
answered
Mar 14, 2014
by
balaji.thirumalai
1
answer
A solenoid is 2.7-m long, has a radius of 0.85 cm, and has 600 turns. It carries a current I of 2.5 A. What is the magnitude of the magnetic field B inside the solenoid and far from either end?
jeemain
physics
class12
ch4
moving-charge-and-magnetism
magnetic-field
solenoid-and-toroid
medium
answered
Mar 14, 2014
by
balaji.thirumalai
1
answer
If an electron and a proton having same momentums enter perpendicularly to a magnetic field, then
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-combined-electric-and-magentic-fields
difficult
answered
Mar 3, 2014
by
thanvigandhi_1
1
answer
An uniform electric field and an uniform magnetic field are acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity, then
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-combined-electric-and-magentic-fields
medium
answered
Feb 28, 2014
by
thanvigandhi_1
1
answer
In a region, steady and uniform electric and magnetic fields are present. These two fields are parallel to each other. A charged particle is released from rest in this region. The path of the particle will be a
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-combined-electric-and-magentic-fields
medium
answered
Feb 28, 2014
by
thanvigandhi_1
1
answer
Mark the correct option
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
amperes-circuital-law
easy
answered
Feb 27, 2014
by
thanvigandhi_1
1
answer
Consider the following statements
Statement 1: A proton enters a strong magnetic field along the field direction. Its path and velocity remain the same
Statement 2: The field exerts no force on the particle
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
easy
answered
Feb 25, 2014
by
thanvigandhi_1
1
answer
Consider the following statements
Statement 1: A magnetic field interacts with a moving charge and not with a stationary charge
Statement 2: A moving charge produces a magnetic field
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
easy
answered
Feb 25, 2014
by
thanvigandhi_1
1
answer
Consider the following statements
Statement 1: The energy of a charged particle cannot change in magnetic field
Statement 2: If the magnetic field does not change with time, there is no induced electric
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-fieldmedium
answered
Feb 25, 2014
by
thanvigandhi_1
1
answer
Consider the following statements
Statement 1: The energy of a charged particle does not change in spatially varying magnetic field
Statement 2: The instantaneous work done by magnetic field is zero
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
medium
answered
Feb 25, 2014
by
thanvigandhi_1
1
answer
Consider the following statements
Statement 1: The energy of a charged particle in a uniform magnetic field does not change
Statement 2: Magnetic field does no work
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
easy
answered
Feb 25, 2014
by
thanvigandhi_1
1
answer
Infinitely long wires parallel to the
y
- axis are present in the
x
−
y
plane at
x
=
1
,
x
=
2
,
x
=
4
, and so on. The currents in all the wires with odd serial no is
1
A
in the
+
y
direction while it is
1
A
in the
–
y
direction for all the wires with even serial no. The magnetic field at the origin would be
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-field-due-to-long-wire
difficult
answered
Feb 25, 2014
by
thanvigandhi_1
1
answer
A straight wire of length
ℓ
carries a current
i
. The magnitude of magnetic field at the point
P
is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-field-due-to-long-current-wire
medium
answered
Feb 25, 2014
by
thanvigandhi_1
1
answer
Consider the following statements
Statement 1: A solenoid tends to expand when a current passes through it
Statement 2: Two parallel metallic wires carrying current in the same direction repel each other
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
solenoid-and-toroid
easy
answered
Feb 23, 2014
by
thanvigandhi_1
1
answer
Consider the following statements. Assume the given field to be non-intersecting
Statement 1: Given a field, it is always possible to construct current elements having the magnetic field similar to the given field
Statement 2: Given a field, it is always possible to construct charge distributions having the electric field similar to the given field
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
difficult
answered
Feb 23, 2014
by
thanvigandhi_1
1
answer
A square loop of side
a
carrying a current
i
1
is kept at a distance of
a
from an infinite wire carrying a current
i
2
as shown. The torque on the loop is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
force-between-two-parallel-current
medium
answered
Feb 23, 2014
by
thanvigandhi_1
1
answer
A rectangular loop carrying a current is situated near a long straight wire as shown. If a current
i
now starts flowing through the wire, the loop will
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
force-between-parallel-currents
easy
answered
Feb 23, 2014
by
thanvigandhi_1
1
answer
A conducting wire bent in the form of a parabola
y
2
=
2
x
for
0
≤
x
≤
2
, carries a current
i
=
1
A
in anti- clockwise direction as looked from above the
x
−
y
plane. There exists uniform magnetic field
−
2
ˆ
k
Tesla in the region. The magnetic force on the wire is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
force-on-current-wire-in-magnetic-field
difficult
answered
Feb 23, 2014
by
thanvigandhi_1
1
answer
A particle of specific charge (charge/mass) α starts moving from the origin under the action of an electric field
E
0
ˆ
i
and a magnetic field
B
0
ˆ
k
. Its velocity at
(
x
0
,
0
,
0
)
is
4
ˆ
i
+
3
ˆ
j
. The value of
x
0
is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-combined-electric-and-magnetic-field
medium
answered
Feb 23, 2014
by
thanvigandhi_1
1
answer
A current carrying wire
P
Q
is placed
⊥
to another wire
R
S
carrying a constant current. If the second wire is free to move, it will have
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
force-between-two-current-wires
medium
answered
Feb 23, 2014
by
thanvigandhi_1
1
answer
A metallic wire is folded to form a square loop of side
a
. It carries a current
i
and is kept
⊥
to a uniform magnetic field. If the shape of the loop is changed from a square to a circle without changing its length or current, the amount of work done is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
medium
answered
Feb 23, 2014
by
thanvigandhi_1
1
answer
A particle having charge
q
enters a region of uniform magnetic field
B
directed inwards and is deflected as shown to a distance
d
above the original line of flight as shown. What is the (magnitude of) momentum of the particle?
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magentic-field
difficult
answered
Feb 23, 2014
by
thanvigandhi_1
1
answer
An electron moving with a speed
u
along the
+
v
e
x
- axis and at
y
=
0
enters a region of uniform magnetic field
→
B
=
−
B
0
ˆ
k
after sometime with speed
v
at co-ordinate
y
, then which exists to the right of the
y
- axis. The electron exits from the region
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
easy
answered
Feb 23, 2014
by
thanvigandhi_1
1
answer
Velocity and acceleration vector of a charged particle moving in a magnetic field at some instant are
→
V
=
3
ˆ
i
+
4
ˆ
j
a
n
d
→
B
=
2
ˆ
i
+
x
ˆ
j
. Select the incorrect alternative
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
medium
answered
Feb 23, 2014
by
thanvigandhi_1
1
answer
Two identical coils are placed coaxially. They carry equal currents in the same direction. Then
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-field-axis-of-circular-current-loop
easy
answered
Feb 23, 2014
by
thanvigandhi_1
1
answer
A conducting rod of mass
m
and length
L
is moving down a smooth incline plane on inclination
θ
with constant velocity
v
. A current
i
is flowing in the conductor in a direction perpendicular to the paper inwards. A vertically upward magnetic field
→
B
exists in space. Its magnitude is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magentic-field
medium
answered
Feb 23, 2014
by
thanvigandhi_1
1
answer
Magnetic field at the centre of a circular loop of area
A
is
B
. Then magnetic moment of the loop is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-field-axis-of-circular-current-loop
easy
answered
Feb 23, 2014
by
thanvigandhi_1
1
answer
A proton, a deuteron and an
α
- particle having the same kinetic energy are moving in circular trajectories in a constant magnetic field. If
r
p
,
r
d
and
r
α
denote respectively the radii of the trajectories of these particles, then
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
easy
answered
Feb 23, 2014
by
thanvigandhi_1
1
answer
A battery is connected between two points
A
and
B
on the circumference of a uniform conducting ring of radius
r
and resistance
R
. One of the arcs
A
B
of the ring subtends an angle
θ
at the centre. The intensity of the magnetic field at the centre due to a constant current in the ring is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-field-on-axis-of-circular-current-loop
difficult
answered
Feb 23, 2014
by
thanvigandhi_1
1
answer
The magnetic field at the centre of an equilateral triangular loop of side
2
L
carrying a current
i
is
jeemain
aipmt
physics
cbse
class12
ch4
moving-chare-and-magnetism
magnetic-field-due-to-straight-conductor
medium
answered
Feb 22, 2014
by
thanvigandhi_1
1
answer
Same current is flowing in three infinitely long wires along positive
x
,
y
and
z
directions. The magnetic field at the point
(
0
,
0
,
−
a
)
would be
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-field-due-to-straight-conductor
medium
answered
Feb 22, 2014
by
thanvigandhi_1
1
answer
A wire of length
ℓ
is bent to form a circular coil of some turns. A current
i
flows through the coil and is placed in a uniform magnetic field
B
. The maximum torque on the coil can be
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
torque-on-current-loop-in-magnetic-field
difficult
answered
Feb 22, 2014
by
thanvigandhi_1
1
answer
A conducting rod of mass
m
and length
ℓ
is placed over a smooth table. A uniform magnetic field is acting perpendicular to the rod. Charge
q
is suddenly passed through the rod and it acquires a velocity
v
on the surface, then
q
is equal to
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-force
difficult
answered
Feb 22, 2014
by
thanvigandhi_1
1
answer
A charged particle is projected with velocity
υ
0
along the positive
x
- axis. The magnetic field
B
is directed along negative
z
- axis for the region
0
<
x
<
L
. The particle emerges out at
x
=
L
at an angle of
60
∘
with the direction of projection. Find the velocity with which the same particle is projected at
x
=
0
along the
+
v
e
x
- axis so that when it emerges out at
x
=
L
, the angle made by it is
30
∘
direction of projection with the
jeemain
aipmt
physics
cbse
class12
ch4
ch5
moving-charge-and-magnetism
motion-in-a-magnetic-field
difficult
answered
Feb 22, 2014
by
thanvigandhi_1
1
answer
A charge particle moves in a circular path in possible electric and magnetic fields. Which of the following scenarios is possible?
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
easy
answered
Feb 22, 2014
by
thanvigandhi_1
1
answer
In a coaxial straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
amperes-circuital-law
easy
answered
Feb 22, 2014
by
thanvigandhi_1
1
answer
Two parallel wires carry currents
20
A
and
40
A
in the opposite directions. Another wire carrying a current
30
A
parallel to
40
A
is placed mid-way between the two wires. The force on it will be
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
force-between-two-parallel-currents
easy
answered
Feb 22, 2014
by
thanvigandhi_1
1
answer
An electric current
ı
enters and leaves a uniform circular wire of radius
ℜ
through diametrically opposite points. A charged particle q moving along the axis of the circular wire passes through the centre at speed
v
. The magnetic force acting on the particle when it passes through the centre is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
easy
answered
Feb 22, 2014
by
thanvigandhi_1
1
answer
A ring of mass m, radius R having charge q uniformly distributed over it and free to rotate about its own axis is placed in a region having a magnetic field B parallel to its axis. If the magnetic field is suddenly switched off, the angular velocity acquired by the ring is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
difficult
answered
Feb 22, 2014
by
thanvigandhi_1
1
answer
Circular arc of a wire of radius R makes an angle of 3π/2 radians at the centre. If a current i flows through it, the magnetic field intensity at the centre of the circle will be
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-field-on-axis-of-circular-current-loop
easy
answered
Feb 22, 2014
by
thanvigandhi_1
1
answer
Two parallel connecting wires placed at a distance d apart carry equal currents in the same direction then the intensity of the magnetic field at a point between them will be
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
feild-due-to-parallel-currents
easy
answered
Feb 22, 2014
by
thanvigandhi_1
1
answer
A uniform magnetic field exists in a region which forms an equilateral triangle of side
a
. The field is perpendicular to the plane of the triangle. A charge
q
enters the triangle with speed
v
along the
⊥
bisector of one of the sides and comes out along the
⊥
bisector of the other side. Intensity of the magnetic field is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
medium
answered
Feb 22, 2014
by
thanvigandhi_1
1
answer
Consider the following statements
Statement 1: If a charged particle is released in a region of uniform electric and magnetic fields parallel to each other, it will move in a straight line
Statement 2: The magnetic field exerts no force on the particle but electric field does
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-combined-electric-and-magnetic-field
easy
answered
Feb 22, 2014
by
thanvigandhi_1
1
answer
Consider the following statements
Statement 1: A long straight conductor carrying a current lies along the axis of a current carrying ring. The conductor will not exert any force on the ring
Statement 2: The magnetic field due to a straight conductor coincides with the ring
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-field-due-to-circular-current-loop
easy
answered
Feb 22, 2014
by
thanvigandhi_1
1
answer
Consider the following statements
Statement 1: A cyclotron cannot accelerate neutrons
Statement 2: Neutrons are neutral
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
easy
answered
Feb 22, 2014
by
thanvigandhi_1
1
answer
Consider the following statements
Statement 1: Free electrons are in a state of motion in a conductor. Even then no magnetic force acts on them unless a current is passed through it
Statement 2: The average velocity of free electrons is zero
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-force
easy
answered
Feb 21, 2014
by
thanvigandhi_1
1
answer
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