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In the given circuit calculate potential...

In the given circuit calculate potential difference between the points P and Que.

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Applying kirchhoff's voltage law
`1+8-12+21+9I=0`
`I=(1)/(3)A`
Potential differencebetween the points P and Q `=9xx(1)/(3)=3` volt.
or `V_(p)xx1+8-12+2I=V_(Q)rArrV_(p)-V_(Q) =3` volt.
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