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Questions  

A battery of e.m.f. 10 V and internal resistance 0.5 ohm is connected across a variable resistance R. The value of R for which the power delivered in it is maximum is given by

a
2.0 ohm
b
0.25 ohm
c
1.0 ohm
d
0.5 ohm

detailed solution

Correct option is D

For maximum power,  r = R.

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