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a coil of wire is connected to an uncharged capacitor in a magnetic field.... |
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| Jun7-07, 10:29 PM | #1 |
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a coil of wire is connected to an uncharged capacitor in a magnetic field....
1. The problem statement, all variables and given/known data
A 10-turn coil of wire having a diameter of 1.0 cm and a resistance of 0.20 ohms is in a 1.0 mT magnetic field with the coil oriented for maximum flux. The coil is connected to an uncharged 1.0 microFarad capacitor rather than to a current meter. The coil is quickly pulled out of the magnetic field. Afterward, what is the voltage across the capacitor? Hint: Use I=dq/dt to relate the net change of flux to the amount of charge that flows to the capacitor. 2. Relevant equations potential difference = -L dI/dt, where L is the inductance magnetic field, B = Uo NI/l total magnetic flux = N (magnetic field for each turn) = N (Area)(B) = (Uo N^2 A I) / l I = V/R induced emf = |change in magnetic flux/change in time| V = Q/C 3. The attempt at a solution Voltage across the capacitor initially is 0 V, since capacitor is uncharged. I found the total flux to be 7.85 x 10^-7 Wb. The changing flux induces an emf. I'm really stuck here. Can someone please help me? Thanks :) |
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| Jun8-07, 12:22 AM | #2 |
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| Jun8-07, 05:23 AM | #3 |
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