First slide

electric current

Question

Resistivity of the material of a wire is 6 x 10^-8 ohm-m and the intensity of electric field inside it is 12 x 10^-6 V/m. if cross sectional area of the wire is 1 mm² , the electric current flowing through it is

Moderate

A

0.5 A
B

1.2 A
C

0.4 A
D

0.02 A

Solution

Current density $j = \frac{E}{ρ} = \frac{12 \times 10^{- 6}}{6 \times 10^{- 8}} A / m^{2} = 200 A / m^{2}$
$∴ i = jA = 200 \times 10^{- 4} Amp = 0 .02 A$

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