oldhw21_pdf

# oldhw21_pdf - mcconnell(kam2342 – oldhomework 21 –...

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mcconnell (kam2342) – oldhomework 21 – Turner – (60230) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points Consider the setup shown in the sketch. The conducting slab has a thickness b and a width a . The magnetic field is constant which points into the paper. For this part of the problem the voltmeter is disconnected from the circuit. There is a steady flow of a horizontal current I moving from left to right, or a steady flow of electrons from right to left with an average drift velocity v d . In the direction perpendic- ular to the drift velocity, there is a magnetic force on the electrons that must be cancelled out by an electric force. L b a I P 1 P 2 V vector B vector B y x How much electric force is produced by the magnitude of the corresponding electric field? 1. E = I B 2. E = a v d b B 3. E = 3 v d B 4. E = v d / (2 B ) 5. E = v d B 6. E = v 2 d B 7. E = a v d B 8. E = v d I B 002 (part 2 of 2) 10.0 points A voltmeter (with an internal resistance less than infinity) is connected to the system, where the contact points are on the upper and lower surfaces and are in the same verti- cal plane.

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