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OpenStudy (anonymous):
find the resistance of a piece if copper wire of length 20mm and diameter 0.5mm, take the resistivity to be 1.68 x 10 ^-8 ohms
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OpenStudy (anonymous):
\[R =\rho \times( length \div Area)\]
OpenStudy (anonymous):
\[Area =( \pi \times \times diamater \times diameter)\div 4\]
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