Question 350: Current Electricity

Question

In a potentiometer experiment the balancing with a cell is at  length $$240$$ $$cm.$$ On shunting the cell with a resistance of $$2\Omega ,$$ the balancing length becomes $$120$$ $$cm$$. The internal resistance of the cell is

Accepted Answer

The internal resistance of the cell,
$$r = \left( {{{{\ell _1} - {\ell _2}} \over {{\ell _2}}}} ight) 	imes R$$
$$ = {{240 - 120} \over {120}} 	imes 2 = 2\Omega $$

Answer

$$0.5\Omega $$

Answer

$$1\Omega $$

Answer

$$2\Omega $$

Answer

$$4\Omega $$

Current Electricity

In a potentiometer experiment the balancing with a cell is at length $240 cm. On shunting the cell with a resistance of 2\Omega , the balancing length becomes 120 cm$. The internal resistance of the cell is

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