A flexible loop has a radius of 14.3 cm and it is in a magnetic field of B = 0.1

Question

A flexible loop has a radius of 14.3 cm and it is in a magnetic field of B = 0.196 T. The loop is grasped at points A and B and stretched until its area is zero. It takes 0.231 s to close the loop. What is the magnetic flux ?B through the loop before it is streched? What is the magnetic flux through the loop after it is stretched? What is the magnitude of the average induced electromotive force ? in the loop during the stretching process?

A flexible loop has a radius of 14.3 cm and it is in a magnetic field of B = 0.196 T. The loop is grasped at points A and B and stretched until its area is zero. It takes 0.231 s to close the loop. What is the magnetic flux ?B through the loop before it is streched? What is the magnetic flux through the loop after it is stretched? What is the magnitude of the average induced electromotive force ? in the loop during the stretching process?

Explanation / Answer

a)

= A B = R^2 B = 3.1416*14.3e-2*14.3e-2*0.196 = 0.012592 0.0126

b)

= A B = 0 * B = 0

c)

= 0.0126

emf = /t = 0.0126/0.231 = 0.0545 V

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