When a battery connected across a resistor of 16Ω , the voltage across the resistor is 12V.When the same battery is connected across a resistor of 10Ω , voltage across it is 11V. The internal resistance of the battery in ohms is
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a
10/7
b
20/7
c
25/7
d
30/7
answer is B.
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Detailed Solution
r=E−V1V1R1=E−V2V2R2 solve for E and substitute for r