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A cell of emf E and internal resistance ...

A cell of emf E and internal resistance r is connected to a variable external resistor R. the graph which gives the terminal voltage of cell V with respect to R is

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
B
`V=E-Ir=E-(Er)/(R+r)`
or,`(dV)/(dR)=(Er)/((R+r)^2)`
therefore, the slope of the V-R graph is positive and it decreases with increses in resistance R.
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