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A capacitor is connected across an oscillating emf with a peak current through the capacitor of 7.00 A. If the frequency ω is doubled, what is the peak current?

7.00 A

4.95 A

3.50 A

14.0 A

1 Answer

  • The reactance (a bit like resistance) of a capacitor is Z = 1/(ωC) = 1/(2πfC)

    Look at the formula – doubling ω halves the reactance. It’s a bit like halving the resistance in a simple DC circuit. So current doubles from 7A to 14A.

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