How do you do the last part? A flexible loop has a radius of 10.9 cm and it is i

Question

How do you do the last part?

A flexible loop has a radius of 10.9 cm and it is in a magnetic field of B 0.169 T. The loop is grasped at points A and B and stretched until its area is zero. It takes 0.243 s to close the loop, what is the magnetic flux B through the loop before it is streched? 6.31x103 Wb Yo u are correct. Previous Tries What is the magnetic flux through the loop after it is stretched? 0.0 Wb You are correct. Previous Tries What is the magnitude of the average induced electromotive force in the loop during the stretching process? 2.59 (102) V Hints: se Faraday's induction law: induced electromotive force is equal to the time rate of change of the magnetic flux through the loop. Do we have to worry about the minus sign? Submit Answer Incorrect. Tries 3 /20 Previous Tries

Explanation / Answer

B = 0.169 T

r = 10.9 cm

t = 0.243 s

Initial area = Ai = pi*r^2 = 0.0373 m^2

Final area = Af = 0

a) Flux before stretched = B*Ai = 0.169*0.0373 = 6.31*10^-3 Wb

b) Flux after stretched = B*Af = 0.169*0 = 0 Wb

c) EMF = /t = BA/t = (0.169*0.0373)/ (0.243) = 25.97 mV

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