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Recent questions tagged ch4
Questions
An ionized gas contains both $+ve$ and $-ve$ ions. If an electric field is applied in the $+x$ direction and a magnetic field is applied in the $+z$ direction,
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-combined-electric-and-magnetic-field
easy
asked
Feb 21, 2014
by
thanvigandhi_1
1
answer
Two particles $ X$ and $Y$ equal charges enter a region of uniform magnetic field after being accelerated through the same potential difference and describe circular paths of radii $R_X$ and $R_Y$ respectively. The ratio of their masses is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
easy
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
The ratio of the magnetic field at the centre of a current carrying coil to its magnetic moment is $ x$. If the current and the radius are both doubled, the new ratio will become
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
torque-on-current-loop-and-magnetic-dipole
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
A coil having $N$ turns is wound tightly in the form of a spiral with inner and outer radii as $a$ and $b$ respectively. The magnetic field at the centre when a current $i$ passes through it is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
solenoid-and-toroid
difficult
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
A particle of charge $q$ and mass $m$ is moving with a constant velocity v along $+x$ - axis. It enters a region of constant magnetic field along $-z$ - axis from $x = a$ to $x = b$. The minimum value of $ v$ required so that the particle can enter the region $x>b$ is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
easy
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
A charged particle enters a magnetic field with the velocity vector making a $45^{\circ}$ magnetic field. If the pitch of the helical path followed by the particle is $\wp$, its radius will be angle with the
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
Net magnetic field at the centre of the circle $O$ due to a current carrying loop as shown in the figure for $ \theta < 180^{\circ}$ is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-field-due-to-circular-current-loop
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
The dimensions of magnetic flux are
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-force
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
A charge $q$ moves along the $x$-axis with a velocity of 5 m/s in a uniform magnetic field $ \overrightarrow B = \hat i + \hat j + \hat k$ The force experienced by the charge will be
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-force
easy
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
Which of the options represents Biot – Savart’s Law for a point charge particle Q moving with velocity $ \overrightarrow V$ ?
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
biot-savart-law
difficult
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
Given the scenario that follows, what will be $y$-coordinate of the particle when it collides with the screen? A particle having charge $q = 1C$ and mass = $1Kg$ is released from rest at the origin. The region has Electric and Magnetic fields given by: $E = 10 \hat I N/C$ for $x \leq 1.8m$ and $B = -5 \hat k T$ for $1.8m \leq x \leq 2.4m$. A screen is placed at $x = 3.0m$ parallel to the $y-z$ plane. Gravity is to be neglected.
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-combined-electric-and-magnetic-field
difficult
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
A conducting ring of mass 2 Kg and radius $0.5m$ is placed on a smooth horizontal surface. The ring carries a current $i = 10A$. A horizontal magnetic field $B = 4T$ is now switched on. The angular acceleration of the ring will be
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
difficult
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
Magnetic moment of an electron in the $n^{th}$ orbit of the hydrogen atom is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-force
difficult
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
A large metal sheet carries an electric current along its surface with $ \lambda$ being the current per unit length. The value of the magnetic field near the surface of the sheet is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-field-due-to-moving-charges
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
There exists uniform electric and magnetic fields in space. A particle is moving with a velocity $ \overrightarrow v$ and suddenly a hollow metallic cube is enclosed around it. The change in force exerted on the particle is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magentic-field
motion-in-combined-electric-and-magentic-fields
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
Two parallel wires carrying equal currents in the opposite directions are placed at $x = \pm$ a parallel to the $y$-axis with $z = 0$. Magnetic field at origin $O$ is $B1$ and at $P (2a,0,0)$ is $B2$. Then the ratio $ \large\frac{B1}{B2}$ is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
force-between-two-parallel-currents
torque-on-current-loop-and-magnetic-dipole
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
A wire of length $1m$ is placed in $x-z$ plane carries a current of $1A$. The coefficient of friction between the wire and the surface is $0.2$ and the mass of the wire is $2\; Kg$. The magnetic field of strength $2T$ exists along positive $y$ direction. Then which of the following is correct
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-force
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
A charged particle enters a magnetic field at right angles to the magnetic field. The field exists for a length equal to 1.5 times the radius of the circular path of the particle. The particle will deviate from its path by
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magentic-field
easy
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
Ratio of the magnetic field at the centre of a current carrying coil of radius $R$ and at a distance of $3R$ on its axis is
jeemain
aipmt
physics
cbse
class12
ch4
-and-magnetism
magnetic-field-on-axis-of-current-circular-loop
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
A uniform magnetic field $ \overrightarrow B = B_0\hat j$ exists in space. A particle of mass $m$ and charge $q$ is projected towards negative $x$-axis with speed $v$ from a point $(d,0,0)$. The maximum value of $v$ for which the particle does not hit the $y-z$ plane is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
easy
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
An electron is moving along positive $ x$-axis. A uniform electric field exists along negative $y$-axis. What should be the direction of the magnetic field (constant) so that the force on the electron is zero?
jeemain
aipmt
physics
cbse
class12
ch4
ch5
magnetic-effects-of-current-and-magnetism
q12
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
A copper wire of diameter $1.6mm$ carries a current i. The maximum magnetic field due to this wire is $5 \times 10^{-3} T$. The value of $i$ is
jeemain
aipmt
physics
cbse
class12
ch4
ch5
magnetic-effects-of-current-and-magnetism
q11
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
A proton beam is going from north to south and an electron beam is going from south to north. Neglecting the earth’s magnetic field, the electron beam will be deflected (consider only magnetic forces)
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
force-between-two-parallel-currents
medium
asked
Feb 19, 2014
by
thanvigandhi_1
1
answer
A moving charge produces
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-of-charged-particles
easy
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
A charged particle is moving along a magnetic field line. The magnetic force on the particle is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
easy
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
A charged particle is moving in a region of uniform magnetic field and a parallel uniform electric field. At some time the velocity of the particle is perpendicular to the magnetic field. The trajectory of the particle will be
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
medium
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
A charged particle is moving in a constant magnetic field and at some point it has its velocity vector making an acute angle with the magnetic field. The path of the particle will be
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
medium
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
A positively charged particle projected towards north is deflected towards west by a magnetic field. The field may be
jeemain
aipmt
physics
cbse
class12
ch4
ch5
magnetic-effects-of-current-and-magnetism
q5
easy
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
A charged particle is whirled on a horizontal flat table by attaching it to a string fixed at one point. If a magnetic field is switched on in the vertical direction, the tension in the string
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-force
easy
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
Which of the following particles will have minimum frequency of revolution when projected with the same velocity perpendicular to a constant magnetic field?
jeemain
aipmt
physics
cbse
class12
ch4
moving-charges-and-magnetism
motion-in-a-magnetic-field
medium
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
Which of the following particles will describe the smallest circle when projected with the same velocity perpendicular to a constant magnetic field?
jeemain
aipmt
physics
cbse
class12
ch4
moving-charges-and-magnetism
motion-in-a-magnetic-field
easy
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
Which of the following particles will experience maximum magnetic force when projected with the same velocity perpendicular to a constant magnetic field?
jeemain
aipmt
physics
cbse
class12
ch4
ch5
moving-charge-and-magnetism
magnetic-force
easy
asked
Feb 17, 2014
by
thanvigandhi_1
1
answer
Alternating current cannot be measured by $DC$ ammeter because
jeemain
physics
current-electricity
cbse
class12
ch4
electric-current-concepts
easy
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
A parallel plate condenser with a dielectric of dielectric constant $K$ between the plates has a capacity $C$ and is charged to a potential of $V$ volts. The dielectric slab is slowly removed from between the plates and then reinserted. The net work done by the system in this process is
jeemain
physics
electrostatics
electrostatic-potential-and-capacitance
cbse
class12
ch4
medium
asked
Feb 16, 2014
by
thanvigandhi_1
1
answer
A parallel plate capacitor is made by stacking $n$ equally spaced plates connected alternatively. If the capacitance between any two adjacent plates is C then the resultant capacitance is
jeemain
physics
electrostatics
electrostatic-potential-and-capacitance
cbse
class12
ch4
medium
asked
Feb 15, 2014
by
thanvigandhi_1
1
answer
A parallel plate capacitor with air between the plates has a capacitance of $9\: pF$. The separation between the plates is $d$ . The space between the plates is now filled with two dielectrics. One of the dielectrics has dielectric constant $k_1=3$ and thickness $ \large\frac{d}{3}$ while the other has dielectric constant $k_2=6$ and thickness $ \large\frac{2d}{3}$. Capacitance of the capacitor is now
jeemain
physics
cbse
class12
ch4
electrostatics
electrostatic-potential-and-capacitance
effect
-of-dielectric-on-capacitance
medium
asked
Feb 14, 2014
by
thanvigandhi_1
1
answer
$ \text{If } \Delta = \begin{vmatrix} a_{11}&a_{12}&a_{13} \\ a_{21}&a_{22}&a_{23} \\ a_{31}&a_{32}&a_{33} \end{vmatrix} \text{ and } A_y \text{ is Cofactor of } a_y \text{, then the value of } a_{11}A_{21}+a_{12}A_{22}+a_{13}A_{23}=? $
cl786
cbse
class12
bookproblem
ch4
sec4
q5
p126
easy
sec-a
math
asked
Feb 11, 2014
by
rvidyagovindarajan_1
1
answer
A wire of length $L$ and $3$ identical cells of negligible internal resistances are connected in series. Due to the current, the temperature of the wire is raised by $ \Delta T$ in a time $t$. A number $N$ of similar cells are now connected in series with a wire of the same material and cross-section but of length $2L$. The temperature is raised by the same amount $ \Delta T$ in the same time. The value of $N$ is
jeemain
physics
current-electricity
cbse
class12
ch4
electrical-energy-and-power
difficult
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
In steady state, a resistor is carrying a current $i$. The power lost to the surroundings is $b(T- T_0)$. Here $b$ is a constant, $T$ is the temperature of the resistance and $T_0$ is the surrounding temperature. If the coefficient of linear expansion is $ \alpha$. The strain in the wire is
jeemain
physics
current-electricity
cbse
class12
ch4
electrical-energy-and-power
difficult
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
The length of the potentiometer wire is l. A cell of emf E is balanced at length $ \large\frac{l}{3}$ from the positive end of the wire. If the length of the wire is increased by $ \large\frac{l}{2}$, at what distance will the same cell give a balance point
jeemain
physics
current-electricity
cbse
class12
ch4
medium
meter-bridge-and-potentiometer-instrumentation
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
Two wires of resistivity $\rho 1$ and $ \rho 2$ are connected in parallel. Equivalent resistivity of the combination is
jeemain
physics
current-electricity
cbse
class12
ch4
resistivity
medium
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
Two wires of resistivity $\rho 1$ and $\rho 2$ are connected in series. Equivalent resistivity of the combination is
jeemain
physics
current-electricity
cbse
class12
ch4
resistivity
medium
asked
Feb 6, 2014
by
thanvigandhi_1
1
answer
The potential difference across the terminals of a battery is 10V when there is a current of 3A in the battery from the negative to the positive terminal. When the current is 2A in the reverse direction, the potential difference becomes 15V. The internal resistance of battery is
jeemain
physics
current-electricity
cbse
class12
ch4
easy
cells-emf-internal-resistance
asked
Feb 6, 2014
by
thanvigandhi_1
1
answer
Which of the following has the maximum resistance?
jeemain
physics
current-electricity
cbse
class12
ch4
easy
meter-bridge-and-potentiometer-instrumentation
concepts
asked
Feb 6, 2014
by
thanvigandhi_1
1
answer
Two identical batteries having emf 2.4 V and internal resistance 0.5$ \Omega$ are connected as shown. Potential Difference between A and B is
jeemain
physics
current-electricity
cbse
class12
ch4
cells-emf-internal-resistance
medium
asked
Feb 6, 2014
by
thanvigandhi_1
1
answer
Current through the 2$ \Omega$ resistor is
jeemain
physics
current-electricity
cbse
class12
ch4
kirchoffs-law-wheatstone-bridge
easy
asked
Feb 6, 2014
by
thanvigandhi_1
1
answer
A piece of copper and another of silicon are cooled from room temperature to 75K. The resistance of
jeemain
physics
current-electricity
cbse
class12
ch4
electric-current-conceptseasy
asked
Feb 6, 2014
by
thanvigandhi_1
1
answer
In the adjoining infinite circuit, what is the effective resistance as seen by the battery
jeemain
physics
current-electricity
cbse
class12
ch4
equivalent-resistance
difficult
asked
Feb 5, 2014
by
thanvigandhi_1
1
answer
To double the full scale reading of any galvanometer turned into a voltmeter, you must
jeemain
physics
current-electricity
cbse
class12
ch4
meter-bridge-and-potentiometer-instrumentation
difficult
asked
Feb 5, 2014
by
thanvigandhi_1
1
answer
The value of each of the resistors is R. The equivalent resistance between A and B is
jeemain
physics
current-electricity
cbse
class12
ch4
equivalent-resistance
easy
asked
Feb 5, 2014
by
thanvigandhi_1
1
answer
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