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the resistance and inductance of series ...

the resistance and inductance of series circuit are `5Omega` and `20H` respectively. At the instant of closing the switch, the current is increasing at the rate `4A-s`. The supply voltage is

A

`20V`

B

`80V`

C

`120V`

D

`100V`

Text Solution

Verified by Experts

The correct Answer is:
B
`i=i_(0)(1-e^(-(Rt)/(L)))implies(di)/(dt)=-(i_(0)(-R ))/(L))=(E)/(L)implies4=(E)/(20)impliesE=80V`
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