1. You have a wire of length L = 1.4 m for making a square coil of a dc motor. T

Question

1. You have a wire of length L = 1.4 m for making a square coil of a dc motor. The current in the coil is I = 2.1 A, and the magnetic field of the motor has a magnitude of B = 0.20 T. Find the maximum torque exerted on the coil when the wire is used to make (a) a single-turn square coil and (b) a two-turn square coil.

2.

In a lightning bolt, 18 C of charge flows in a time of 8.6 x 10-3 s. Assuming that the lightning bolt can be represented as a long, straight line of current, what is the magnitude of the magnetic field at a distance of 24 m from the bolt?

Explanation / Answer

maximum torque will be produced when the magnetic field is in the same plane as the square coil .....

torque = 2*iBL =2*2.1*0.2*1.4 =1.176 Nm

if 2 turn coil....then torque= 2*(2i)*BL =2*2*2.1*0.2*1.4=2.352 Nm

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