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Student's Name Student's T # A motional emf device, made of a 10 cm long metal bar sliding along a metal rail, is used to generate light for a 100 W light ball. The inward magnetic field strength B = 0.10 T and the resistance of the light ball is R = 100 omega What is the speed of the metal bar should move? What is the direction of the induce emf?
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let I is the induced current
a) P = I^2*R

==> I = sqrt(P/R)

= sqrt(100/100)

= 1 A

induced emf = I*R

B*v*L = I*R

==> v = I*R/(B*L)

= 1*100/(0.1*0.1)

= 10000 m/s

b) direction of induced emf is counter clockowise
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