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Q.

In an electric circuit shown in the figure, the external resistance R is variable. It is found that same power is developed in external resistance R if its value is either 5  Ω  or  20  Ω.  With this information find the internal resistance (r) of the voltage source.

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a

20  Ω

b

8  Ω

c

103  Ω

d

10  Ω

answer is D.

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Detailed Solution

I=   ER+r,  P=I2R=E2RR+r2Now  P1=P2 ⇒  E255+r2 =  E22020+r2 ⇒ r=10 Ω
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