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In the given circuit, if the potential d...

In the given circuit, if the potential difference across the internal resistance `r_1` is equal to E, then the resistance R is equal to:

A

`R = r_1-r_2`

B

`R = r_1+r_2`

C

`R = (r_1 r_2)/(r_1+r_2)`

D

`R = ((r_1)^2)/(r_1+r_2)`

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