In a current-carrying long solenoid, the field produced does not depend upon:

1. Number of turns per unit length 2. Current flowing
3. Radius of the solenoid 4. All of the above

Subtopic:  Ampere Circuital Law |
 85%
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A neutral point is obtained at the centre of a vertical circular coil carrying current. The angle between the plane of the coil and the magnetic meridian is :

1. 0                           2. 45°

3. 60°                       4. 90°

Subtopic:  Earth's Magnetism (OLD NCERT) |
 57%
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If the current is flowing in the south direction along a power line, then what will be the direction of the magnetic field above the power line (neglecting the earth's field)?

1. South 2. East
3. North 4. West
Subtopic:  Magnetic Field due to various cases |
 61%
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An electron and a proton with equal momentum enter perpendicularly into a uniform magnetic field, then :

1. The path of proton shall be more curved than that of electron

2. The path of proton shall be less curved than that of electron

3. Both are equally curved

4. Path of both will be a straight line

Subtopic:  Lorentz Force |
 62%
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Two particles A and B of masses mA and mB respectively and having the same type of charge are moving in a plane. A uniform magnetic field exists perpendicular to this plane. The speeds of the particles are vA and vB respectively, and the trajectories are as shown in the figure. Then

                                

1. mAvA<mBvB                              

2. mAvA>mBvB

3. mA<mB and vA<vB                  

4. mA=mB and vA=vB

Subtopic:  Lorentz Force |
 82%
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An electric current passes through a long straight wire. At a distance 5 cm from the wire, the magnetic field is B. The field at 20 cm from the wire would be :

1. B6                   

2. B4

3. B3                     

4. B2 

Subtopic:  Magnetic Field due to various cases |
 94%
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Two particles X and Y having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describes circular path of radius R1 and R2 respectively. The ratio of mass of X to that of Y is :

1.  R1R21/2                        2.  R2R1

3.  R1R22                            4.  R1R2  

Subtopic:  Lorentz Force |
 61%
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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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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 

1. NAIB                               2. 2NAIB 

3. 2πNAIB                           4. 4πNAIB

Subtopic:  Magnetic Moment |
 73%
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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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