A cell of e.m.f. E is connected with an external resistance R , then p.d. across cell is V . The internal resistance of cell will be

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Solution

The correct option is B

Let the current in the circuit $= i = \frac{V}{R}$ . Across the cell, $E = V + i r \Rightarrow r = \frac{E - V}{i} = \frac{E - V}{\frac{V}{R}} = (\frac{E - V}{V}) R$

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A cell of e.m.f. E is connected with an external resistance R , then p.d. across cell is V . The internal resistance of cell will be

The correct option is B Let the current in the circuit =i=VR. Across the cell, E=V+ir⇒r=E−Vi=E−VVR=(E−VV)R

The correct option is B

Let the current in the circuit $= i = \frac{V}{R}$ . Across the cell, $E = V + i r \Rightarrow r = \frac{E - V}{i} = \frac{E - V}{\frac{V}{R}} = (\frac{E - V}{V}) R$