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A conducting loop is pulled with a const...

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

A

clockwise while entering

B

anti-clockwise while entering

C

zero when completely inside

D

clockwise while leaving

Text Solution

Verified by Experts

When the loop is drawn into the magnetic filed, 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 say 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 entry 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 current in it will be reversed (clockwise)
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