1.

In the following circuit, resistance of potentiometer wire is `100 Omega`. Power consumption in potentiometer wire is same when jockey is placed at 10 cm from end A or end B. Internal resistance of cell (r ) is A. `30 Omega`B. `6 Omega`C. `60 Omega`D. `3 Omega`

Answer» Correct Answer - A
a. Case I : 10 cm from A `P_1= (epsilon/(r+10))^2 xx 10`
Case II : 10 cm from B `P_2 = (epsilon/(r+90))^2 xx 90`
`P_1 = P_2 implies r = 30 Omega` .


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