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A wire has resistance
PHYSICS · Single correct · A Level · Physics · Electricity · Electricity
Problem
A wire has resistance
R
R
R
. Its length is doubled while its diameter is halved. What is the new resistance? (a)
2
R
2R
2
R
(b)
8
R
8R
8
R
(c)
4
R
4R
4
R
(d)
R
8
\dfrac{R}{8}
8
R
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