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Quiz5-1Bb_w_solutions

Quiz5-1Bb_w_solutions - the vertical component of Earth’s...

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Department of Physics, UCSD Winter 2009 – Physics 1B(b) Prof. Dimitri Basov Quiz 5, March 6 (Version A) 1. A cube of edge length = 2 . 5 cm is positioned as shown in the figure. There is a uniform magnetic field throughout the region with components of B x = +5 . 0 T, B y = +4 . 0 T and B z = +3 . 0 T. Calculate the flux through the shaded face of the cube. (a) 1 . 875 × 10 - 3 T · m 2 (b) 2 . 500 × 10 - 3 T · m 2 (c) 3 . 125 × 10 - 3 T · m 2 (d) 25 . 00 T · m 2 (e) 31 . 25 T · m 2 2. A 25-turn circular coil of wire has a diameter of 1.00 m. It is placed with its axis along the direction of Earth’s magnetic field of 50 . 0 μ T, and then, in 0.200 s, it is flipped by 180 . An average emf of what magnitude is generated in the coil? (a) 0 . 39 mV (b) 2 . 46 mV (c) 4 . 91 mV (d) 9 . 82 mV (e) 19 . 64 mV 3. A helicopter has blades of length 3.0 m, rotating at 2.0 rev/s about a central hub. If
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Unformatted text preview: the vertical component of Earth’s magnetic Feld is 5 . × 10-5 T, what is the emf induced between the blade tip and the central hub? (a) 0 . 9 mV (b) 2 . 8 mV (c) 5 . 6 mV (d) 30 mV 1 (e) 90 mV 4. Find the direction of the current through the resistor in the ±gure at the instant the switch is closed. (a) Left to right (b) Right to left (c) There is no current 5. A copper loop is placed with its face perpendicular to a magnetic ±eld which has direction to the left. You are looking from the right and the loop is stationary. If the magnetic ±eld is decreasing in time, what is the direction of the induced current? (a) Clockwise (b) Counterclockwise (c) There is no current Good luck! 2...
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