Magnetics 4 Question 10
11. A conducting circular loop of radius $r$ carries a constant current $i$. It is placed in a uniform magnetic field $\mathbf{B} _0$ such that $\mathbf{B} _0$ is perpendicular to the plane of the loop. The magnetic force acting on the loop is
(1983, 1M)
(a) $\operatorname{ir} \mathbf{B} _0$
(b) $2 \pi i r \mathbf{B} _0$
(c) zero
(d) $\operatorname{\pi ir} \mathbf{B} _0$
Passage Based Questions
Passage
The figure shows a circular loop of radius $a$ with two long parallel wires (numbered 1 and 2) all in the plane of the paper. The distance of each wire from the centre of the loop is $d$. The loop and the wires are carrying the same current $I$. The current in the loop is in the counter-clockwise direction if seen from above.
(2014 Adv.)
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Answer:
Correct Answer: 11. (c)
Solution:
- Magnetic force on a current carrying loop in uniform magnetic field is zero.
