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11_Chapter 19 HomeworkCH19 Magnetism

# 11_Chapter 19 HomeworkCH19 Magnetism - Magnetism 19.22 151...

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Magnetism 151 19.22 The magnitude of the torque is sin NBIA τ θ = , where θ is the angle between the field and the perpendicular to the plane of the loop. The circumference of the loop is 2 2.00 r m π = , so the radius is 1.00 m π = r and the area is 2 2 1 m A r π π = = . Thus, ( )( ) ( ) 3 2 3 1 0.800 T 17.0 10 A m sin90.0 4.33 10 N m π = × ° = × 1 τ 19.23 The area is ( )( ) 2 0.200 m 0.150 m 0.094 2 m A ab π π = = = 90.0 . Since the field is parallel to the plane of the loop, θ = ° ( ) ( ) ( ) and the magnitude of the torque is 4 2 sin 8 2.00 10 T 6.00 A 0.094 2 m sin90.0 NBIA 4 9.05 10 N m τ θ = × = ° = × The torque is directed to make the left-hand side of the loop move toward you and the
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