Question 638: Current Electricity

Question

In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs?

Accepted Answer

$$\phi$$ = constant
E
unknown
= $$\phi$$ I
b
$$\Rightarrow$$ E
unknown
$$\propto$$ I
b
$${{{E_1}} \over {{E_2}}} = {{{I_1}} \over {{I_2}}} \Rightarrow {{1.5} \over {2.5}} = {{36} \over x}$$
$$x = {{36 	imes 5} \over 3} = 60$$ cm

Answer

62 cm

Answer

60 cm

Answer

21.6 cm

Answer

64 cm

Current Electricity

In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs?

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