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The maximum current in a 21 F capacitor connected to an ac generator with a frequency of 120 Hz is 0.

(See attached file for full problem description with proper symbols)
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4. The maximum current in a 21 µF capacitor connected to an ac generator with a frequency of 120 Hz is 0.12 A.
(a) What is the maximum voltage of the generator?
V
(b) What is the voltage across the capacitor when the current in the circuit is 0.10 A and increasing?
V
(c) What is the voltage across the capacitor when the current in the circuit is 0.10 A and decreasing?
V
I don't really know how to apply the root mean square and when to do it, and I don't understand AC circuits well.  So, I didn't know how to solve this problem.
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4. The maximum current in a 21 µF capacitor connected to an ac
generator with a frequency of 120 Hz is 0.12 A.
(a) What is the maximum voltage of the generator?
V
(b) What is the voltage across the capacitor when the current in the
circuit is 0.10 A and increasing?
V
(c) What is the voltage across the capacitor when the current in the
circuit is 0.10 A and decreasing?
V
I don’t really know how to apply the root mean square and when to do
it, and I don’t understand AC circuits well. So, I didn’t know how
to solve this problem.

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