P28_047 - 47. (a) The voltage difference V across the...

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Unformatted text preview: 47. (a) The voltage difference V across the capacitor varies with time as V (t) = E (1 − e−t/RC ). At t = 1.30 µ s we have V (t) = 5.00 V, so 5.00 V = (12.0 V)(1 − e−1.30 µs/RC ), which gives τ = (1.30 µ s)/ ln(12/7) = 2.41 µs. (b) C = τ /R = 2.41 µs/15.0 kΩ = 161 pF. ...
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