Quiz5-1Bb_w_solutions

Quiz5-1Bb_w_solutions - the vertical component of Earths...

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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 Fgure. There is a uniform magnetic Feld throughout the region with components of B x = +5 . 0 T, B y = +4 . 0 T and B z = +3 . 0 T. Calculate the ±ux 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 Feld of 50 . 0 μ T, and then, in 0.200 s, it is ±ipped 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 Earths 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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Quiz5-1Bb_w_solutions - the vertical component of Earths...

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