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Physics
Physics
Problem
A copper wire has resistance R, length l and radius r. If its length and radius are both doubled, what will be its new resistance? a)
2
R
2R
2
R
b)
R
4
\dfrac{R}{4}
4
R
c)
R
2
\dfrac{R}{2}
2
R
d)
R
R
R
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