A magnetic needle is kept in a non-uniform magnetic field. It experiences

1. A force and a torque

2. A force but not a torque

3. A torque but not a force 

4. Neither a torque nor a force

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A long magnetic needle of length 2L, magnetic moment M and pole strength m units is broken into two pieces at the middle. The magnetic moment and pole strength of each piece will be

1. M2,m2

2. M,m2

3. M2,m

4. M, m

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Two identical thin bar magnets each of length l and pole strength m are placed at the right angle to each other with the north pole of one touching south pole of the other. The magnetic moment of the system is :

1. ml

2. 2ml

3. 2ml

4. 12ml

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Rate of change of torque  with deflections maximum for a magnet suspended freely in a uniform magnetic field of induction B, when

(a) θ=0o                        (b) θ=45o

(c) θ=60o                      (d) θ=90o

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Force between two identical bar magnets whose centres are r metre apart  is 4.8 N, when their axes are in the same line. If separation is increased to 2r, the force between them is reduced to

1. 2.4N                         2. 1.2N

3. 0.6N                         4. 0.3N

Concept Questions :-

Analogy between electrostatics and magnetostatics
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A bar magnet of magnetic moment 104J/T is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of 4×10–5 T to a direction 60° from the field will be

1. 0.2 J                          2. 2.0 J

3. 4.18 J                        4. 2 × 102 J

Concept Questions :-

Analogy between electrostatics and magnetostatics
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Two equal bar magnets are kept as shown in the figure. The direction of resultant magnetic field, indicated by arrow head at the point P is (approximately)

1. 

2. 

3. 

4. 

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A straight wire carrying a current i is turned into a circular loop. If the magnitude of the magnetic moment associated with it in M.K.S. unit is M, the length of wire will be

1. 4πiM                          2. 4πMi

3. 4πiM                        4. Mπ4i

Concept Questions :-

Magnetic moment
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Two similar bar magnets P and Q, each of magnetic moment M, are taken. If P is cut along its axial line and Q is cut along its equatorial line, all the four pieces obtained have

1. Equal pole strength          2. Magnetic moment M/4

3. Magnetic moment M/2      4. Magnetic moment M

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A magnet of magnetic moment 50i ^A-m2 is placed along the x-axis in a magnetic field B=(0.5i^+3.0j^)T. The torque acting on the magnet is

1. 175 k^ N-m

2. 150 k^ N-m

3. 75 k^ N-m

4. 2537 k^ N-m

Concept Questions :-

Analogy between electrostatics and magnetostatics
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