A battery of internal resistance 4Ω is connected to the network of resistance as shown. If the maximum power can be delivered to the network, the value of R in Ω should be
A
4/9
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B
2
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C
8/3
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D
18
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Solution
The correct option is B 2 The equivalent circuit are as shown in the figure This circuit represents Wheatstone Bridge. So, this 6R resistance is ineffective. Now the equvalent resistance will be, 1Req=1(2R+4R)+1(R+2R) 1Req=16R+13R=1+26R Req=2R For maximun power, External resistance = Internal resistance 2R=4 R=2Ω