A cell of emf E and internal resistance r supplies current for the same time t through external resistance R₁ and R₂ seperately. If the heat developed in both the cases is the same, then the internal resistance r will be

Options

(a) r=√R₁+R₂
(b) r=√R₁xR₂
(c) r=R₁+R₂/2
(d) r=1/R₁+1/R₂

Correct Answer:

r=√R₁xR₂

Explanation:

No explanation available. Be the first to write the explanation for this question by commenting below.