Question 434: Current Electricity

Question

A $$1 \mathrm{~m}$$ long copper wire carries a current of $$1 \mathrm{~A}$$. If the cross section of the wire is $$2.0 \mathrm{~mm}^{2}$$ and the resistivity of copper is $$1.7 	imes 10^{-8}\, \Omega \mathrm{m}$$, the force experienced by moving electron in the wire is ____________ $$	imes 10^{-23} \mathrm{~N}$$.
(charge on electorn $$=1.6 	imes 10^{-19} \,\mathrm{C}$$)

Accepted Answer

$$I = ne{v_d}A$$
$$J = {E \over ho }$$
$$F = eE = {{1.7 	imes 1.6 	imes {{10}^{ - 19}} 	imes {{10}^{ - 8}}} \over {2 	imes {{10}^{ - 6}}}}$$
$$ = 136 	imes {10^{ - 23}}$$ N

Current Electricity

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