# Quiz 5 - y direction Is there an attractive force a...

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ECE3025, Summer 2011, Quiz 5 June 23, 2010 1. (2 points) Name two of the three causes of a magnetic ﬁeld. 2. (2 points) Use Faraday’s law to explain how an alternator works. 3. (3 points) Current is ﬂowing in the same direction in two parallel wires. Is there an attractive force, a repulsive, or no force between them. Show this mathematically. 4. (3 points) Current is ﬂowing in two wires that are at right angles from each other. One current is ﬂowing in the ˆ x direction, the other in the ˆ
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Unformatted text preview: y direction. Is there an attractive force, a repulsive force, or no force between them. Show this mathematically. 5. (3 points) Show that displacement current has units of Amps. 6. (2 points) Does a current induced by a changing magnetic ﬁeld obey Kirchkoﬀ’s Voltage Law? 7. (10 points) Find the emf induced in a square loop with sides a lying in the yz-plane in a region in which the magnetic ﬁeld changes over time as ~ B ( t ) = B exp(-5 t/t )ˆ x 1...
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