The drawing shows a rectangular loop of wire (with N turns which encloses an are

Question

The drawing shows a rectangular loop of wire (with N turns which encloses an area, A) which resides in the x-z plane. The loop carries a Current I in the direction indicated. The loop is fixed so that it can rotate about the x-axis. There exists a constant magnetic field B, which is oriented such that everywhere it points in a direction which is 20degrees above the x-y plane. What is the net torque exerted on the loop and will the top segment of the loop rotate towards the positive y-axis (clockwise as seen from the positive x-axis) or negative y-axis (counterclockwise as seen from the positive x-axis?

a) NIABsin20 towards positive y

b) NIABsin20 towards negative y

c) NIABsin70 towards positive y

d) NIABsin70 towards negative y

Explanation / Answer

b) NIABsin20 towards negative y

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