A uniform wire of length and radius has a resistance of

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

A uniform wire of length

l

and radius

r

has a resistance of

100 \Omega

. It is recast into a wire of radius

\frac{r}{2}

. The resistance of new wire will be: (1)

1600 \Omega

(2)

400 \Omega

(3)

200 \Omega

(4)

100 \Omega

Related theory

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