test2_309Lspring10 - PHYSICS 309L TEST 2 1 By what distance...

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PHYSICS 309L, TEST 2 1) - By what distance must two currents of +330 A each be separated so that the force per unit length between them is 10 - 2 N/m . - In order for this force per unit length to be repulsive, how should the two currents be flowing? 2) A coil with 250 loops of conducting wire is subject to a magnetic field that went from 0 T to 1 T in 0 . 1 s . - What is the change of the electric potential induced by the changing magnetic field? - In words what can you say about the direction of the current induced in the loops? (hint: the direction of the induced current must be such that. ..) 3)What is the resistance of a 60
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