Questions
A rectangular coil of size 3.0 cm 4.0cm and having 100 turns, is pivoted about the z-axis as shown in figure . The coil carries an electric current of 2.0 A and a magnetic field of 1.0 T is present along the y-axis. Find the torque acting on the coil if the side in the x-y plane makes an angle with the x-axis. (Take )
detailed solution
Correct option is A
The magnetic moment of the loop is where n is the number of turns, i is the current and is the area-vector. The direction of is determined by the sense of the current and in this case it lies in the fourth quadrant making an angle with the negative y-axis. Torque
Thus,
The torque is along the positive z-axis.
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