The resistivity of gold is 2.44 x 10^-8 ohms at a temperature of 20 degrees C. A

Question

The resistivity of gold is 2.44 x 10^-8 ohms at a temperature of 20 degrees C. A gold wire, 0.5 mm in diameter and 44 cm long, carries a current of 380 am. The number of electrons per second passing given cross section of the wire, is closest to: a) 2.8 x 10^14 b) 2.4 x 10^18 c) 1.2 x 10^22 d) 6.3 x 10^15 e) 2.4 x 10^17
The resistivity of gold is 2.44 x 10^-8 ohms at a temperature of 20 degrees C. A gold wire, 0.5 mm in diameter and 44 cm long, carries a current of 380 am. The number of electrons per second passing given cross section of the wire, is closest to: a) 2.8 x 10^14 b) 2.4 x 10^18 c) 1.2 x 10^22 d) 6.3 x 10^15 e) 2.4 x 10^17
The resistivity of gold is 2.44 x 10^-8 ohms at a temperature of 20 degrees C. A gold wire, 0.5 mm in diameter and 44 cm long, carries a current of 380 am. The number of electrons per second passing given cross section of the wire, is closest to: a) 2.8 x 10^14 b) 2.4 x 10^18 c) 1.2 x 10^22 d) 6.3 x 10^15 e) 2.4 x 10^17

Explanation / Answer

I = 380 mA
I = 0.38 A

Charge of 1 electron = 1.6 * 10^-19
Let no of electrons passing per second be N.

N * 1.6 * 10^-19 = 0.38
N = 2.4 * 10^18

Correct Option :- (B)
Electron passing per second, Q = 1.6 * 10^-19 * 0.38

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