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Q.

The relation between R and r (internal resistance of the battery) for which the power consumed in the external part of the circuit is maximum.

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a

R = r

b

R=r2

c

R = 2r

d

R = 1.5 r

answer is B.

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Detailed Solution

Circuit is forming a wheatstone bridge Req=2RFor maximum power transfer 2R = r.
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The relation between R and r (internal resistance of the battery) for which the power consumed in the external part of the circuit is maximum.