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A cell of e.m.f. E is connected with an ...

A cell of e.m.f. E is connected with an external resistance R , then p.d. across cell is V . The internal resistance of cell will be

A

`((E-V)R)/E`

B

`((E-V)R)/V`

C

`((V-E)R)/V`

D

`((V-E)R)/E`

Text Solution

Verified by Experts

The correct Answer is:
B
`V =E-ir`
`rArr V = E-(E/(R + r))r rArr V(R + r) = ER + Er - Er`
`rArr (R(E-V))/V`
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