A battery of internal resistance 4 ohm is connected to the network of resistance as shown. In the order that the maximum power can be delivered to the network, the value of R in ohm 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 B2
The given circuit is a balanced Wheatstone bridge. [Fig. 1]
No current will flow across 6R o the side CD. [Fig. 2]
∴ The equivalent circuit is:- [Fig. 3]
For maximum power net external resistance=Total internal resistance