PHYS 241 recitation
Su-Ju Wang
2011.03.28
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announcements
• If you forget to bring your i-clicker, then no
way to get credits.
• The second exam is on April 5th.
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Quiz 1
Two coils of wire are placed close together. Initially, a
current of 2.5 A exists in one of the coils, but there is no
current in the other. The current is then switched off in a
time of 3.7 x10-2 s. During this time, the average emf
induced in the other coil is 1.7V. What is the mutual
inductance of the two-coil system?
(A) 1.72e-2
(B) 2.52e-2
(C) 3.7e-2
(D) 1.15e-2
(E) 0.40e-2
Ans: B
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Quiz 2
Ans: E
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Quiz 3
Ans: A
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