Question 241: Current Electricity

Question

A current of 10A exists in a wire of cross-sectional area of 5 mm2 with a drift velocity of 2 $$	imes$$ 10$$-$$3 ms$$-$$1. The number of free electrons in each cubic meter of the wire is ___________.

Accepted Answer

$$I = neA{V_d}$$
$$n = {I \over {eA{V_d}}}$$
$$ = {{10} \over {1.6 	imes {{10}^{ - 9}} 	imes 5 	imes {{10}^{ - 6}} 	imes 2 	imes {{10}^{ - 3}}}}$$
$$ = {{{{10}^{25}}} \over {16}} = 6.25 	imes {10^{27}} = 625 	imes {10^{25}}$$

Answer

625 $$	imes$$ 1025

Answer

1 $$	imes$$ 1023

Answer

2 $$	imes$$ 1025

Answer

2 $$	imes$$ 106

Current Electricity

A current of 10A exists in a wire of cross-sectional area of 5 mm2 with a drift velocity of 2 $\times 10-3 ms-$1. The number of free electrons in each cubic meter of the wire is ___________.

Choose the correct answer: