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  • A conducting loop is pulled with a constant velocity towards a region of uniform magnetic field of induction B as shown in the figure. Then the current involved in the loop is (d > r)

A conducting loop is pulled with a constant velocity towards a region of uniform magnetic field of induction B as shown in the figure. Then the current involved in the loop is (d > r)

Option: 1

clockwise while leaving


Option: 2

anti-clockwise while entering


Option: 3

zero when completely inside


Option: 4

All of above options are correct


Answers (1)

best_answer

When the loop is drawn into the magnetic field, the area of the portion loop in the magnetic field will increase. That means, the flux linkage increases. Therefore a (vortex) emf is induced in the loop so as to oppose the change, that is to oppose the increase in magnetic flux in the loop. Therefore, the current will have to induce in anti-clockwise direction to induce an opposing magnetic field, that is pointing outward of the page. After the complete enter of the loop into the magnetic field, no variation of flux occurs. Therefore it induces no current so long as the loop is completely inside the magnetic field. When it emerges out of the magnetic field, following the previous argument, the direction of induced in it will be reversed (clockwise) Thus last three options are correct.

Posted by

Sanket Gandhi

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