The efficiency of a cell when connected to a resistance R is 60%. What will be its efficiency if the external resistance is increased to six times.

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90%

60%

80%

10%

answer is A.

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Detailed Solution

For Ist caseefficiency = TPDEMF×100=ER/R+rE=RR+r0.6=RR+rHence r=23R In 2nd case x=6R6R+rPut the value of r and get the answer.

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