Question

It takes 22 J of energy to move a 0.30-mC charge from one plate of a...

It takes 22 J of energy to move a 0.30-mC charge from one plate of a 15-μF capacitor to the other. Neglect the change of the charge on the capacitor.

Part A

How much charge is on each plate?

Express your answer using two significant figures and include the appropriate units.

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Answer #1

W = work done in moving the charge = 22 J

V = potential difference between the plates

Q = charge being moved

W = QV

22 = 0.3 x 10-3 V

V = 73333.33 volts = 7.3 x 104 volts

C = capacitance = 15 x 10-6 F

q = charge stored = CV = (15 x 10-6 ) (7.3 x 104 ) = 1.1 C

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