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  4. A conducting loop carrying a current I is placed in a uniform magnetic field pointing into the plane of the paper as shown. The loop will have a tendency to

Q. A conducting loop carrying a current is placed in a uniform magnetic field pointing into the plane of the paper as shown. The loop will have a tendency to Physics Question Image

 2686  213 AIEEEAIEEE 2003Moving Charges and Magnetism Report Error

Solution:

Net force on a current carrying loop in uniform magnetic field is zero. Hence, the loop cannot translate. So, options (c) and (d) are wrong. From Fleming's left hand rule we can see that if magnetic field is perpendicular to paper inwards and current in the loop is clockwise (as shown) the magnetic force on each element of the loop is radially outwards, or the loops will have a tendency to expand.

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