Questions
A 4 μFcapacitor and a resistance of 2.5 M are 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 :
detailed solution
Correct option is B
VC=3VR=3E-VC⇒VC=3E4=E1-e-t/RC ⇒e-t/RC=14 ⇒et/RC=4 ⇒tRC=ln 4⇒t=RC ln 4Talk to our academic expert!
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A copper wire of cross-sectional area 2.0 mm2 , resistivity , carries a current of 1 A. The electric field in the copper wire is
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