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%
From NCERT
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A, B, and C are parallel conductors of equal length carrying currents I, I, and 2I respectively. Distance between A and B is x. Distance between B and C is also x. F1 is the force exerted by B on A and F2 is the force exerted by C on A choose the correct answer:

                    

1. F1=2F2                                 

2. F2=2F1

3. F1=F2                                   

4. F1=-F2  

Subtopic:  Force between Current Carrying Wires |
 55%
From NCERT
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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 |
 75%
From NCERT
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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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Current i is carried in a wire of length L. If the wire is turned into a circular coil, the maximum magnitude of torque in a given magnetic field B will be:

1. LiB22                     2. Li2B2

3. L2iB4π                     4. Li2B4π

Subtopic:  Current Carrying Loop: Force & Torque |
 77%
From NCERT
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Three long, straight parallel wires carrying current, are arranged as shown in figure. The force experienced by a 25 cm length of wire C is

 

(1) 10-3N

(2) 2.5×10-3N

(3) Zero

(4) 1.5×10-3N

Subtopic:  Force between Current Carrying Wires |
 78%
From NCERT
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An arrangement of three parallel straight wires placed perpendicular to the plane of paper carrying the same current I along the same direction as shown in the figure. Magnitude of force per unit length on the middle wire B is given by:

1. μoi22πd

2. 2μ0i2πd

3. 2μoi2πd

4. μoi22πd

Subtopic:  Force between Current Carrying Wires |
 62%
From NCERT
NEET - 2017
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A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the center of loop is B. It is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be

1.  nB               
2.  n2B
3.  2nB             
4. 2n2B

Subtopic:  Magnetic Field due to various cases |
 79%
From NCERT
NEET - 2016
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An electron is moving in a circular path under the influence of a transverse magnetic field of 3.57×10-2 T. If the value of e/m is 1.76×1011 C/kg, the frequency of revolution of the electron is

(1) 1 GHz             

(2) 100 MHz

(3) 62.8 MHz         

(4) 6.28 MHz

Subtopic:  Lorentz Force |
 64%
From NCERT
NEET - 2016
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A square loop ABCD carrying a current i, is placed near and coplanar with a long straight conductor XY carrying a current I, the net force on the loop will be:

           

1. μ0Ii2π              2. 2μ0IiL3π

3. μ0IiL2π            4. 2μ0Ii3π

Subtopic:  Current Carrying Loop: Force & Torque |
 55%
From NCERT
NEET - 2016
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