Two thin long parallel wires separated by a distance b are carrying a current i amp each. The magnitude of the force per unit length exerted by one wire on the other is

(1) μ0i2b2                                 

(2) μ0i22πb 

(3) μ0i2πb                                  

(4) μ0i2πb2 

Subtopic:  Force between Current Carrying Wires |
 85%
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To make the field radial in a moving coil galvanometer :

(1) The number of turns in the coil is increased

(2) Magnet is taken in the form of horse-shoe

(3) Poles are cylindrically cut

(4) The coil is wounded on the aluminum frame

Subtopic:  Moving Coil Galvanometer |
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In a moving coil galvanometer, the deflection of the coil θ is related to the electrical current i by the relation

(1) itanθ                 

(2) iθ 

(3) iθ2                    

(4) iθ 

Subtopic:  Moving Coil Galvanometer |
 71%
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A moving coil galvanometer has N number of turns in a coil of effective area A, it carries a current I. The magnetic field B is radial. The torque acting on the coil is 

(1) NA2B2I                          

(2) NABI2

(3) N2ABI                            

(4) NABI

Subtopic:  Moving Coil Galvanometer |
 92%
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If a particle of charge 10-12 coulomb moving along the x^ - direction with a velocity 105 m/s experiences a force of 10-10 newton in y^- direction due to magnetic field, then the minimum magnetic field is 

(1)  6.25×103 tesla in z^- direction

(2)  10-15  tesla in z^- direction

(3)  6.25×10-3 tesla in z^- direction

(4)  10-3 tesla in z^- direction 

Subtopic:  Lorentz Force |
 83%
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A small coil of N turns has an effective area A and carries a current I. It is suspended in a horizontal magnetic field B. such that its plane is perpendicular to B.. The work done in rotating it by 180° about the vertical axis is 

(a) NAIB                               (b) 2NAIB 

(c) 2πNAIB                          (d) 4πNAIB

Subtopic:  Magnetic Moment |
 73%
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An electron moves with a constant speed v along a circle of radius r. Its magnetic moment will be (e is the electron's charge)

(1) evr                       

(2) 12evr 

(3) πr2ev                    

(4) 2πrev 

Subtopic:  Magnetic Moment |
 75%
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Four wires each of length 2.0 metres are bent into four loops P, Q, R and S and then suspended into uniform magnetic field. Same current is passed in each loop. Which statement is correct?

                       

(1) Couple on loop P will be the highest

(2) Couple on loop Q will be the highest

(3) Couple on loop R will be the highest

(4) Couple on loop S will be the highest

Subtopic:  Magnetic Moment |
 71%
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A circular current carrying coil has a radius R. The distance from the centre of the coil on the axis where the magnetic induction will be 18th to its value at the centre of the coil, is

(1) R3                       

(2)  R3

(3) 23R                     

(4) 23R

Subtopic:  Magnetic Field due to various cases |
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Which among the following options needs to be decreased to increase the sensitivity of a moving coil galvanometer?

1.  the number of turns in the coil. 2. the area of the coil.
3. the magnetic field. 4. the couple per unit twist of the suspension.

Subtopic:  Moving Coil Galvanometer |
 78%
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