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A capacitor charges from a cell through a resistance. The time constant is τ.after how many time constants will the charge on the capacitor be 10% less than its final charge? (a) 2 (b) 2.303 (c) 1/0.693 (d) 1/0.37 |
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Answer» Correct Answer is: (c) 1/0.693 Q = Q0(1 - e -t/τ ) = 0.9Q0 or e -t/τ = 0.1 or et/τ = 10. |
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