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8. Using Faraday’s law, the induced emf is

dΦ

B

dt

=

d(BA)

dt

=

−B

dA

dt

=

−B

d(πr

2

)

dt

=

2πrB

dr

dt

=

2π(0.12 m)(0.800 T)(0.750 m/s) = 0.452 V .


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