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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

The correct Answer is:
A, B, C, D
When the loop is pulled into the magnetic field the area of the portion loop in the magnetic 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 increases 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 into as the loop is completely inside the magnetic field . When it emerges out of the magnetic field following the previous .
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