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OTP to be sent to Change
i = E/R1 + r
So, P1 = i2R1 = [E/(R1+r)]2R1
Similarly P2 = [E/(R2 +r)]2 R2
Given that P1 = P2
Substituting the values, we get,
r = √(R1R2)
Regards
Arun (askIITians forum expert)
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