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In the circuit (Fig.) what is potential ...

In the circuit (Fig.) what is potential difference `V_(B) - V_(A)` (in `V`) when current `I` is `5 A` and is decreasing at the rate of `10^(3) A s^(-1)`

A

`15 V`

B

`10 V`

C

`-15 V`

D

`20 V`

Text Solution

Verified by Experts

The correct Answer is:
C

Since current is decreasing so induce emf will support main current.

`V_(A)-IR-15-L(dI)/(dt)=V_(B)`
`V_(B)-V_(A)=-IR-15-L(dI)/(dt)=-5xx1-15-5xx10^(-3)xx(-10^(-3))=15` volt
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