You have a wire of length l = 1.9 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 = 0.30 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.

(A) 0.1421 N-m

(b) 0.2842 N-m

Explanation:

We have given length of the wire L =1.9 m

So side of the square

We know that area of the square

Current in the loop i = 2.1 A

Magnetic field B = 0.3 T

(A) Number of turns N = 1

We know that torque is given by

For maximum torque

So torque

(b)  Number of turns N = 2

We know that torque is given by

For maximum torque

So torque

dang that balls went far