Homework Help: physics

Posted by derek on Tuesday, November 13, 2012 at 1:33pm.

Two parallel plate capacitors are identical, except that one of them is empty and the other contains a material with a dielectric constant of 4.2 in the space between the plates. The empty capacitor is connected between the terminals of an ac generator that has a fixed frequency and rms voltage. The generator delivers a current of 0.23 A. What current does the generator deliver after the other capacitor is connected in parallel with the first one?
Help :/

physics - Kay, Saturday, March 2, 2013 at 3:42pm
Vm = Xc Im

Xc = 1/ωC

therefore for fixed V

I2/I1 = C2 /C1

C2 = 4.2C1 + C1 = 5.2C1 (they are connected in parallel)

I2 = (C2/C1)I1 = 5.2*0.22 = 1.144 A

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