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Question

A 4μF capacitor, a resistance of 2.5MΩ is in series with 12V battery. Find the time after which the potential difference across the capacitor is 3 times the potential difference across the resistor. [Given: ln(b)=0.693]
  1. 13.86s
  2. 6.93s
  3. 7s
  4. 14s

A
13.86s
B
6.93s
C
7s
D
14s
Solution
Verified by Toppr

Here, VC=3VR=3(V0VC) where V0=12V, applied voltage.
VC=34V0
V0(1et/RC)=34V0
et/RC=14
et/RC=4

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