Questions
At t =0, an inductor of zero resistance is joined to a cell of emf through a resistance. The current increases with a time constant . After what time will the potential difference across the coil be equal to that across the resistance?
detailed solution
Correct option is B
i=io1−e−R2tdidt=ioR2e−R2tLdidt=ioRe−R2t=ioR2e−R2t=2−1eR2t=2ln2=RLtt=LRln2=τln2Talk to our academic expert!
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In the circuit shown, one of the inductors used is ideal. The potential difference across the batteries is10 V. The current drawn from the battery at steady state, after the switch is closed is
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