A cell of internal resistance 2 π supplies current to a 6 π resistor. The efficiency of the cell is

A cell of internal resistance 2 π supplies current to a 6 π resistor. The efficiency of the cell is
A. 12.0%
B. 25.0%
C. 33.3%
D. 75.0%

Correct Option: Answer is C
Internal resistance determine the maximum current that can be supplied

Efficiency = r / R × 100

= 2 / 6 × 100

= 33.3%

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