A rectangular loop consists of 110 closely wrapped turns and has dimensions 0.40
ID: 1452230 • Letter: A
Question
A rectangular loop consists of 110 closely wrapped turns and has dimensions 0.40 m by 0.30 m. The loop is hinged along the y-axis, and the plane of the coil makes an angle of 30.0° with the x-axis (Fig. P19.24). What is the magnitude of the torque exerted on the loop by a uniform magnetic field of 0.72 T directed along the x axis, when the current in the windings has a value of 1.2 A in the direction shown?
N·m
What is the expected direction of rotation of the loop?
2
clockwise as viewed from above counterclockwise as viewed from the above the loop should not rotate
Explanation / Answer
Magnetic momentum M = NiA
Torque = MxB = NiABsin(theta)
= 110*1.2*0.4*0.3*0.72*sin(90-30)
Torque = 9.88 N.m
direction is counter clockwsie