JEE MAIN - Physics (2022 - 27th July Morning Shift - No. 21)
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 $$1.7 \times 10^{-8}\, \Omega \mathrm{m}$$, the force experienced by moving electron in the wire is ____________ $$\times 10^{-23} \mathrm{~N}$$.
(charge on electorn $$=1.6 \times 10^{-19} \,\mathrm{C}$$)
Respondre
136
Explicació
$$I = ne{v_d}A$$
$$J = {E \over \rho }$$
$$F = eE = {{1.7 \times 1.6 \times {{10}^{ - 19}} \times {{10}^{ - 8}}} \over {2 \times {{10}^{ - 6}}}}$$
$$ = 136 \times {10^{ - 23}}$$ N