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Recent questions in Electric Charges and Fields
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>>
JEEMAIN and NEET
>>
Physics
>>
Class12
>>
Electric Charges and Fields
A conducting spherical shell is earthed. A +ve charge
+
q
1
is placed at its centre and another +ve charge
+
q
2
is placed outside at a distance d from centre . If the conducting spherical shell is not earthed , then force on
q
2
is:
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
medium
asked
Jan 10, 2014
by
meena.p
1
answer
A conducting spherical shell is earthed. A +ve charge
+
q
1
is placed at its centre and another +ve charge
+
q
2
is placed outside at a distance d from centre . If the effect of induced charge due to
q
2
on sphere is ignored. Then coulomb force on
q
2
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
medium
asked
Jan 10, 2014
by
meena.p
1
answer
A charge particle of mass 1 kg and charge
1
μ
c
is projected from horizontal ground at an angle
θ
=
45
∘
with speed
10
m
s
−
1
. In space a horizontal electric field towards the direction of projection
E
=
10
7
N
C
−
1
exists. The range of projectile is :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
medium
asked
Jan 10, 2014
by
meena.p
1
answer
A charge Q is placed at a distance
D
(
>
R
)
above the centre of disk of radius R The magnitude of flux through disk is
ϕ
. Now a hemispherical shell of radius R is put above the disk to form a closed surface. The flux through the closed surface, if direction of area vector along outward normal is +ve, is :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
gausss-law
medium
asked
Jan 10, 2014
by
meena.p
1
answer
Two infinite long parallel wires having linear charge densities
λ
1
a
n
d
λ
2
respectively are placed at a distance R. The force per unit length on wire (1) will be:
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
continuous-charge-distribution
medium
asked
Jan 10, 2014
by
meena.p
1
answer
If a dielectric slab is inserted in between a capacitor of capacitance C after charging it to a potential V, the net charge on surfaces shown below will be :
jeemain
physics
class12
unit11
electrostatics
medium
asked
Jan 10, 2014
by
meena.p
1
answer
If a point charge is placed at the centre of closed cylindrical conductor of length l and radius R. the flux through the cylinder will be :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-flux-and-dipole
medium
asked
Jan 9, 2014
by
meena.p
1
answer
A circular ring of radius R has charge Q distributed uniformly on it. If a space of radius R, has its centre lying on boundary of the ring, then flux coming out of sphere will be :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
gausss-law
medium
asked
Jan 9, 2014
by
meena.p
1
answer
An infinite long semicircular tube is given as shown below one half is given a surface charge density
+
σ
and other half is given charge density
−
,
σ
. Electric field at a point on axis would be
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
continuous-charge-distribution
difficult
asked
Jan 9, 2014
by
meena.p
1
answer
Mark the correct statements :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-charge
medium
asked
Jan 9, 2014
by
meena.p
1
answer
The correct statement for the phenomenon of "Electrostatic Induction " is :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-charge
medium
asked
Jan 9, 2014
by
meena.p
1
answer
Charge Q is given displacement
→
r
=
a
ˆ
i
+
b
ˆ
j
in electric field
→
E
=
E
1
ˆ
i
+
E
2
ˆ
j
.
work done is :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
medium
asked
Jan 8, 2014
by
meena.p
1
answer
In one gram solid, there are
10
22
atoms. If one electron is removed from each one of
0.01
%
of atoms the charge gained by solid would be :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-charge
medium
asked
Jan 8, 2014
by
meena.p
1
answer
A conductor having a cavity is given a positive charge. What are field strengths
E
A
,
E
B
and
E
C
at point A (inside the cavity), B (with in conductor but outside cavity ) and C (outside the conductor ) respectively ?
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
easy
asked
Jan 8, 2014
by
meena.p
1
answer
Choose the correct option : If the point charge is located inside a spherical gaussian surface away from its centre.
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field-and-dipole
easy
asked
Jan 8, 2014
by
meena.p
1
answer
A charge q is placed at centre of cube of side l. The electric flux through one face of cube will be :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
gausss-law
easy
asked
Jan 8, 2014
by
meena.p
1
answer
If
E
e
be the electric field strength of a short dipole at a point on the equitorial line and
E
a
be that on axial line at same distance then :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-flux-and-dipole
easy
asked
Jan 6, 2014
by
meena.p
1
answer
16 dipoles of charge of magnitude e are placed inside a cube. The total electric flux coming out of the cube will be :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-flux-and-dipole
easy
asked
Jan 6, 2014
by
meena.p
1
answer
A capacitor is charged to
3200
V
and then connected across a resistor of resistance R. If after 1 s potential difference across capacitor is 2400 V, What will be the potential difference across after 2 and 3 seconds .
jeemain
physics
class12
ch2
electrostatics
elecrostatic-potential-and-capacitior
parallel-plate-capacitors
easy
asked
Jan 6, 2014
by
meena.p
1
answer
Two equal and opposite charges
8
×
10
−
8
C
are placed
2
×
10
−
2
cm away from a dipole . If this dipole is placed in an external electric field
2
×
10
8
N
/
C
. the value of maximum torque and work done in rotating through
180
∘
will be :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-flux-and-dipole
easy
asked
Jan 6, 2014
by
meena.p
1
answer
Region surrounding electric dipole
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
easy
asked
Jan 6, 2014
by
meena.p
1
answer
If a charge q is rotated around charge Q in a circle of radius y by
90
∘
, the work done will be
jeemain
physics
class12
unit11
electrostatics
easy
sec-a
asked
Jan 6, 2014
by
meena.p
1
answer
A change A is divided into two parts: q and Q-q. if Coulomb repulsion between them when they are separated is maximum ,
Q
Q
−
q
should be :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
medium
asked
Jan 3, 2014
by
meena.p
1
answer
A charge q is placed at middle point of the line joining two equal charges +Q. The value of q such that system is in equilibrium is :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
easy
asked
Jan 3, 2014
by
meena.p
1
answer
A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 25 V. The electric field at centre of sphere is :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
easy
asked
Jan 3, 2014
by
meena.p
1
answer
Two small spherical balls whose charges are
20
μ
c
each are hanged with help of 1 m long thread from roof. In equilibrium both threads are seperated by
60
∘
Tension in each thread is :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
easy
asked
Jan 3, 2014
by
meena.p
1
answer
Two metal balls of same radii are charged to 5 and -25 units of electricity . They are brought in contact with each other and then again seperated to original distance. Ratio of magnitude of force b/w two balls after and before contact is
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
easy
asked
Jan 3, 2014
by
meena.p
1
answer
In a medium of dielectric constant K, the electric field is
→
E
, if
∈
0
is permittivity of free space , the electric displacement vector is :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
easy
asked
Jan 3, 2014
by
meena.p
1
answer
A force F acts between two charges kept 1 cm apart in air. If permittivity of air and dielectric constant of water are
∈
0
and
K
respectively, find the force acting when both atoms are placed in water.
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
easy
asked
Jan 3, 2014
by
meena.p
1
answer
Total electric flux coming out of unit positive charge put in air is :
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
gausss-law
easy
asked
Jan 3, 2014
by
meena.p
1
answer
Two plates are 5 cm apart, a potential difference of 10V is applied between them. What is the electric field between the plates?
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
easy
asked
Dec 20, 2013
by
balaji.thirumalai
1
answer
If three equal charges are placed on three corners of square and force between
q
1
and
q
2
is
F
2
, and the force between
q
1
and
q
2
is
F
3
, find
F
3
/
F
2
jeemain
physics
class12
ch1
electrostatics
coulombs-law
electric-charges-and-fields
force-between-multiple-charges
easy
asked
Dec 20, 2013
by
balaji.thirumalai
1
answer
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