First slide

Faraday's Laws

Question

1.5 A current is flowing through a metallic wire. If it flows for 3 hrs, how many electrons would flow through the wire?

Easy

A

$205 \times 10^{22} electrons$
B

$1 .0 \times 10^{23} electrons$
C

$10^{24} electrons$
D

$4 .5 \times 10^{23} electrons$

Solution

We know that Charge, $q = It = 1 .5 \times 3 \times 60 \times 60 = 16200 C$
${∵ Charge on one electron =1.6×10}^{- 19} C$
$∴ 16200 C chargeison \frac{1 \times 16200}{1 .6 \times 10^{- 19}} = 1 .0 \times 10^{23} electrons$

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