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  • A circular wire loop carrying a current I in the anticlockwise sense is placed in a uniform magnetic field B directed into the plane of the coil as shown in Fig. The loop will tend to <

A circular wire loop carrying a current I in the anticlockwise sense is placed in a uniform magnetic field B directed into the plane of the coil as shown in Fig. The loop will tend to

Option: 1

contract.


Option: 2

expand.


Option: 3

move towards negative x-direction.


Option: 4

move towards positive y-direction.


Answers (1)

best_answer

Since to loop carries a current, a charge (say q ) moves along the circle with a velocity (say v ). The velocity v is tangential to the circle at every point. The direction of v gives the direction of the current as shown in Fig


From Fleming's left hand rule, the direction of the force {F exerted by magnetic field is radially inwards towards O at every point. Hence the loop tends to contract. Furthermore, since F is perpendicular to v, the force does no work on the loop. Hence it cannot have any translatory motion. Thus the correct choice is (c).

Posted by

Shailly goel

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