17) A rigid wire with resistance of 0.100 ohms forms a nearly complete circular

Question

17) A rigid wire with resistance of 0.100 ohms forms a nearly complete circular loop. A 9V battery is connected between points a and b. Find the torque exerted on the wire by a magnetic field of magnitude 0.400 T, directed to the right, in the plane of the loop.

The snwer is 4.52 N-m. PLease explain how to get this answer.

A rigid wire with resistance of 0.100 ohms forms a nearly complete circular loop. A 9V battery is connected between points a and b. Find the torque exerted on the wire by a magnetic field of magnitude 0.400 T, directed to the right, in the plane of the loop.

Explanation / Answer

i = V/R = 9/0.1 = 90 A


Torque, T= N*B*I*A = 1*0.4*90*3.14*0.2^2 = 4.5216 N.m

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