F09 - Exam 3(1)

# F09 - Exam 3(1) - 1 The four wire loops shown have edge...

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1. The four wire loops shown have edge lengths of either L , 2 L , or 3 L . They will move with the same speed into a region of uniform magnetic field , B  directed into the page. Rank them according to the maximum magnitude of the induced emf, least to greatest. A) 3 and 4 tie, then 1 and 2 tie B) 1, 2, 3, 4 C) 1, then 2 and 3 tie, then 4 D) 1 and 2 tie, then 3 and 4 tie E) 4, 2, 3, 1 2. A current i flows through an inductor L in the direction from point b toward point a . There is zero resistance in the wires of the inductor. If the current is decreasing , A) The answer depends on the value of the inductance L. B) the potential is greater at point a than at point b. C) the potential is less at point a than at point b . D) the answer depends on the magnitude of di/dt compared to the magnitude of i. 3. The illustration shows total internal reflection taking place in apeice of glass. The index of refraction of this glass: A) at most 1.15 B) at least 2.0 C) at most 2.0 D) at least 1.15 E) cannot be calculated from the given data Version 1 Page 1

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4. An LC circuit has a capacitance of 30 μ F and an inductance of 15 mH. At time t = 0 the charge on the capacitor is 10 C and the current is 20 mA. The maximum current at any time thereafter is: A) 20 mA B) 42 mA C) 18 mA D) 25 mA E) 35 mA 5. When light travels from medium X to medium Y as shown: A) both the speed and the frequency increase B) both the speed and the wavelength decrease C) both the wavelength and the frequency are unchanged D) both the speed and the frequency decrease E) both the speed and the wavelength increase 6. Immediately after switch S in the circuit shown is closed, the current through
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## This note was uploaded on 09/05/2011 for the course PHYS 116b taught by Professor Haglund during the Spring '07 term at Vanderbilt.

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F09 - Exam 3(1) - 1 The four wire loops shown have edge...

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