Two particles each of mass m and charge q are attached to the two ends of a light rigid rod of length 2R. The rod is rotated at constant angular speed about a perpendicular axis passing through its centre. The ratio of the magnitudes of the magnetic moment of the system and its angular momentum about the centre of the rod is:

1. q2m                               

2. qm

3. 2qm                              

4. qπm 

Subtopic:  Magnetic Moment |
 81%
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A ring of radius R, made of an insulating material carries a charge Q uniformly distributed on it. If the ring rotates about the axis passing through its center and normal to the plane of the ring with constant angular speed ω, then the magnitude of the magnetic moment of the ring is:

1. QωR2                       2. 12QωR2

3. Qω2R                       4. 12Qω2R

Subtopic:  Moving Coil Galvanometer |
 82%
From NCERT
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Three long, straight and parallel wires carrying currents are arranged as shown in the figure. The wire C which carries a current of 5.0 amp is so placed that it experiences no force. The distance of wire C from wire D is then 

                             

1. 9 cm                                         

2. 7 cm 

3. 5 cm                                          

4. 3 cm

Subtopic:  Force between Current Carrying Wires |
 79%
From NCERT
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If m is the magnetic moment and B is the magnetic field, then the torque is given by

(1) m.B                      
(2) |m||B|
(3) m×B                     
(4) |m|.|B|

Subtopic:  Magnetic Moment |
 90%
From NCERT
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What is the net force on the square coil?

              

(1) 1.67×10-6N moving towards wire

(2) 25×10-7N moving away from wire

(3) 35×10-7N moving towards wire

(4) 35×10-7N moving away from wire

Subtopic:  Lorentz Force |
 69%
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A long wire A carries a current of 10 amp. Another long wire B, which is parallel to A and separated by 0.1m from A, carries a current of 5 amp, in the opposite direction to that in A. what is the magnitude and nature of the force experienced per unit length of B (μ0=4π×10-7weber/amp-m)

1. repulsive force of 10-4N/m

2. attractive force of 10-4N/m

3. repulsive force of 2π×10-5N/m

4. attractive force of 2π×10-5N/m

Subtopic:  Force between Current Carrying Wires |
 76%
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The relation between voltage sensitivity (σv) and current sensitivity (σi) of a moving coil galvanometer is (Resistance of Galvanometer = G) 

1. σiG=σv                           

2. σvG=σi

3. Gσv=σi                           

4. Gσi=σv

Subtopic:  Moving Coil Galvanometer |
 69%
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\(A,B, ~\text{and}~C\) are parallel conductors of equal length carrying currents \(I, I,~\text{and}~2I\) respectively. The distance between \(A\) and \(B\) is \(x\). The distance between \(B~\text{and}~C\) is also \(x\)\(F_1\) is the force exerted by \(B\) on \(A\) and \(F_2\) is the force exerted by \(C\) on \(A\) choose the correct answer:

                       
1. \(F_1 = 2F_2\)
2. \(F_2 = 2F_1\)
3. \(F_1 = F_2\)
4. \(F_1 = -F_2\)

Subtopic:  Force between Current Carrying Wires |
 55%
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Two galvanometers A and B require 3mA and 5mA respectively to produce the same deflection of i0 divisions. Then

(1) A is more sensitive than B

(2) B is more sensitive than A

(3) A and B are equally sensitive

(4) Sensitiveness of B is 5/3 times that of A

Subtopic:  Moving Coil Galvanometer |
 74%
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There long straight wires A, B and C are carrying current as shown figure. Then the resultant force on B is directed 

                            

1. Towards A
2. Towards C
3. Perpendicular to the plane of paper and outward
4. Perpendicular to the plane of paper and inward
Subtopic:  Force between Current Carrying Wires |
 74%
From NCERT
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