QuizWk11Soln

QuizWk11Soln - 1 2 3 4 r v r v r v r v Current= B =0 B...

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Name ____________________________________ Section ___________ Physics 208, Spring 08, Week 11 Quiz Apr. 3, 2008 1. At right is a cross-section of a solenoid – a tightly wound coil of wire. The field outside a solenoid is zero, and the field inside is uniform and directed as shown. An Amperian path is shown as a rectangle. Which of the sides of the path contribute to r B " d r s # in Ampere’s law? a) 1 and 3 b) 2 only c) 4 only d) 1 and 2 e) all sides contribute 2. If the coil has 10 turns of wire per cm, and carries a current of 1 amp, calculate the current through the surface bounded by the Amperian path above when L =0.5 cm. 10 turns / cm -> 5 turns in 0.5 cm. The current through the surface bounded by the path is then 5 A. 3. You hold a loop of wire in your hand and move it at constant velocity into and through a region of constant magnetic field directed into the page as shown below. Label the direction of the induced current in the loop as CW, CCW, or zero.
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Unformatted text preview: 1 2 3 4 r v r v r v r v Current= B =0 B " B =0 zero CCW zero CW 4. A permanent magnet moves through a loop of wire as shown. Below is the flux to the right as a function of time. Sketch the induced current as a function of time Since flux to the right is decreasing, induced current will produce additional flux through the loop to the right. This is the direction of the current arrow in the figure, so current is positive. 5. The coil of five turns of wire has a total resistance of 1 . Calculate the maximum magnitude of the induced current for motion in 4. The maximum EMF is d " / dt # 0.002 T $ m 2 /0.2 s = 0.01 V for each turn of wire. The coil has five turns of wire. The total EMF is then 0.05V, and the maximum current is 0.05V/1 =0.05A=50mA. N S " TIME (sec) + 1 mT " m 2 " 1 mT # m 2 0.1 0.2 0.3 0.4 TIME (sec) 0.1 0.2 0.3 0.4 I I...
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This note was uploaded on 04/29/2008 for the course PHYS 208 taught by Professor Rzchowski during the Spring '08 term at Wisconsin.

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QuizWk11Soln - 1 2 3 4 r v r v r v r v Current= B =0 B...

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