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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)/(V)R`

B

`10^(23)`

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
A
Current in the circuit `=I= V//R`
If r = internal resistance of the cell, then
`V= E -Ir`
`:.r =(E-V)/(I) = (E-V)/(V//R) = (E-V)/(V) R`
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