Q.

Figure shows an isosceles triangle wire frame with apex angle equal toπ/2.The frame starts entering into the region of uniform magnetic field B with constant velocity v at t = 0. The longest side of the frame is perpendicular to the direction of velocity. If i is the instantaneous current through the frame then choose the alternative showing the correct variation of i with time.

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a

b

c

d

answer is D.

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Detailed Solution

ϕ=BA=B122xxϕ=Bx2ε=dϕdt=2Bx.vI=εR=2BvRx
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Figure shows an isosceles triangle wire frame with apex angle equal toπ/2.The frame starts entering into the region of uniform magnetic field B with constant velocity v at t = 0. The longest side of the frame is perpendicular to the direction of velocity. If i is the instantaneous current through the frame then choose the alternative showing the correct variation of i with time.