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Unformatted text preview: PHY2054 Section 4350 Quiz 7: Ch 20 October 7, 2011 NAME UFID Show all your work step by step. 1. Use Lenzs law to answer the following questions concerning the direction of induced currents: (a) What is the direction of the induced current in resistor R shown in Figure (a) when the bar magnet is moved to the left? (0.5/5) (b) What is the direction of the current induced in the resistor R right after the switch S in Figure (b) is closed? (0.5/5) (c) What is the direction of the induced current in R when the current I in Figure (c) decreases rapidly to zero? (0.5/5) (d) A copper bar is moved to the right while its axis is maintained in a direction perpendicular to a magnetic field, as shown in Figure (d). If the top of the bar becomes positive relative to the bottom, what is the direction of the magnetic field? (0.5/5) Solution: The solutions are drawn in green color. 2 2. A conducting rod of length l = 35 . 0 cm is free to slide on two parallel conducting bars, as shown in Figure....
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