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Electric Current and Electric Cell

A battery of ...

Question

A battery of emf 10 v and internal resistance of 0.5 ohms is connected across A variable resistance R.The maximum value of R is given by:

A

0.5 Ω

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B

1.00 Ω

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C

2.0 Ω

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D

0.25 Ω

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Solution

The correct option is A $0.5 Ω$
To have maximum power in the circuit R must be equal to internal resistance.

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