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Question: Two cells, e.m.f. of each is \(E\) and internal resistance \(R\). The maximum energy given to the ...

Two cells, e.m.f. of each is EE and internal resistance RR. The maximum energy given to the resistor will be, only when

A

R=r/2R = r / 2

B

R=rR = r

C

R=2rR = 2 r

D

R=0R = 0

Answer

R=r/2R = r / 2

Explanation

Solution

For maximum energy, we have

External resistance of the circuit

= Equivalent internal resistance of the circuit i.e. R=r2R = \frac { r } { 2 }