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## Homework Statement

The potential difference across resistance R carrying current I is V = IR . Now if the potential difference is measured via voltmeter of resistance r , the reading on voltmeter is V' . Prove that V' = Ir/(R+r) . For what value of r does the voltmeter measure true value

## Homework Equations

V=ir

## The Attempt at a Solution

Initially , V = IR

FINALLY, Rnet = R × r / ( R + r)

V' = I' Rnet , where I' is telhe new current in circuit..

I don't know how to proceed