A cell sends a current through a resistance R1, for one second and then sends current through another resistance R2 for one second. Same heat is produced in both the resistances. The internal resistance of the cell is
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a
R1-R2
b
R2 +R2
c
R1R2
d
R12−R22
answer is C.
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Detailed Solution
i1=ER1+r and i2=ER2+rAlso i12R1=i22R2∴ E2R1R1+r2=E2R2R2+r2Solving, we get r =R1R2