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Anonymous asked in Science & MathematicsPhysics · 1 decade ago

How to find the capacitance and the time constant of a circuit?

A capacitor is charged to a potential of 12.0 {\rm V} and is then connected to a voltmeter having an internal resistance of 3.60 M\Omega. After a time of 4.10 s the voltmeter reads 3.2 V.

Part A

What is the capacitance?

B

What is the time constant of the circuit?

2 Answers

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  • billrussell42
    Lv 7
    1 decade ago
    Favorite Answer

    voltage on a cap, discharging

    v = v₀e^(–t/RC)

    You have your units screwed up again.

    substitute into the equation above and solve for C

    time constant is RC

    .

  • Birjis M
    1 decade ago

    refer to arihant's text.. it's good

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