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Resistance

A potentiomet...

Question

A potentiometer wire has a resistance per unit length $0.1 Ω / m$ . A cell of e.m.f. 1.5 V balances against 300 cm length of the wire. Find the current through potentiometer wire.

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Solution

Balance point of potentiometer $= 300 c m = 3 m$
Resistance per unit length $= 0.1 Ω / m$
Resistance up to balance point $= 0.3 Ω$
$E . m . f$ of cell $= 1.5 V$
current $= \frac{1.5}{0.3} = 5 A$
We get, current $= 5 A .$

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