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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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# Homework Help: A coil of wire is connected to an uncharged capacitor in a magnetic field

**Physics Forums | Science Articles, Homework Help, Discussion**