JEE Mains · Physics · STD 12 - 3. current electricity
A \(1\,m\) long copper wire carries a current of \(1\,A\). If the cross section of the wire is \(2.0\,mm ^{2}\) and the resistivity of copper is \(1.7 \times 10^{-8}\,\Omega\,m\). the force experienced by moving electron in the wire is \(\times 10^{-23}\,N\). (charge on electron \(=1.6 \times 10^{-19}\,C\) )
- A \(137\)
- B \(136\)
- C \(135\)
- D \(134\)
Answer & Solution
Correct Answer
(B) \(136\)
Step-by-step Solution
Detailed explanation
\(l=1\,m\) \(i =1\,A\) Area \(=2 \times 10^{-6}\) \(\rho=1.7 \times 10^{-8}\) \(R =\frac{\rho \ell}{ A }=\frac{1.7 \times 10^{-8} \times 1}{2 \times 10^{-5}}=\frac{1.7}{2} \times 10^{-2}\) \(V =\frac{1.7}{2} \times 10^{-2}\)…
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