Question

A planar coil of area 40 cm2 is in a uniform magnetic field of 2.3 T pointing out of the plane. A light bulb of resistance 20 Ω is connected to the coil. The coil is rotated by an angle of 60 degrees such that wire 1 comes towards us and wire 2 goes behind the plane. When viewed from the top, it is rotated in the counter-clockwise direction.

a) Find the total charge (in µC) which goes through the light bulb in this process of rotation. (Hint: I = q/t) b)

B) Is the direction of current in wire 1 up or down? Explain why.

c) If the wire is rotated the other way, clockwise from the top, what will be the answer for part b? Explain.

Answer 1

C) if the wire is rotated the other way then a clockwise current is induced or we can say that the current starts flowing due north in wire 1 ( which is in accordance with lenz law as explained in part (b) )

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