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KVPY SA Exam 2016 Question Paper

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Question : 21

Total: 80

The diagram below shows two circular loops of wire (A and B) centred on and perpendicular to the x-axis and oriented with their planes parallel to each other. The y-axis passes vertically through loop A (dashed line). There is a current lB in loop B as shown, Possible actions which we might perform on loop A are:

(i) Move A to the right along x axis closer to B
(ii) Move A to the left along X axis away from B
(iii) As viewed from above, rotate A clockwise about y axis
(iv) As viewed from above, rotate A anticlockwise about y axis
Which of these actions will induce a current in A only in the direction shown,

Only (i)
Only (ii)
Only (i) and (iv)
Only (ii) and (iii)

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