Moving Charges and Magnetism

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Question

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Question 1 :

A current carring coil is placed in a uniform magnetic field. If the coil turns through an angle θ, then the torque is directly proportional to ____________

1. tan θ
2. sin θ
3. cot θtan θ
4. cos θ
Answer
8920

Question 2 :

The sensitivity of a tangent galvanometer can be increased by increasing __________

1. the external magnetic field
2. the radius of the coil
3. the number of turns of the coil
4. all the above
Answer
8921

Question 3 : The permeability of a paramagnetic substance is __________
1. negative
2. very large
3. less than unity
4. small but more than unity
Answer
8922

Question 4 : Which of the following shows that the earth behaves as a magnet?
1. Attraction between unlike poles
2. Repulsion between like poles
3. No existence of isolated magnetic poles
4. Null points in the magnetic field of a bar magnet
Answer
8923

Question 5 :

Circular loop of radius 0.0157 m carries a current 2 A. The magnetic field at the centre of the loop is ___________

1. 8.0 × 10^-5 Wb/m²
2. 1.57 × 10^-3Wb/m²
3. 3.l4 × 10^-1 Wb/m²
4. 2.0 × 10^-3 Wb/m²
Answer
8924