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Q.

The resistance and inductance of series circuit are 5Ω and 20H, respectively. At the instant of closing the switch, the current is increasing at the rate 4As−1. The supply voltage is___________V

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answer is 80.

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Detailed Solution

For growth of current in L-R circuit, current is given by i=i01−eRt/L
∴didt=−i0−RLeRt/L=i0RLe−Rt/L, At the instant of closing the switch,didt=i0RL=EL
⇒4=E20∴E=20×4=80V

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