Question

please help in question no. 6​

Answer 1

Answer:

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Answer 2

Question :

Current of 200mA is flowing in a conductor. How many free electrons will flow through it in per second.

Given :

Current flow = 200mA

To Find :

Number of electrons passing through conductor per second.

Solution :

❖ First of all we need to find amount of charge flow in conductor$.$

Electric current is defined as the rate of charge flow per unit time.

Mathematically, I = Q / t

» I denotes current

» Q denotes charge

» t denotes time

• It is a scalar quantity having only magnitude.
• SI unit : A

By substituting the given values;

• I = 200 mA = 0.2 A

➝ I = Q / t

➝ 0.2 = Q / 1

➝ Q = 0.2 × 1

➝ Q = 0.2 C

♦ As per law of quantization, Q = n e

• n denotes number of electrons
• e denotes charge of an electron

➙ Q = n e

➙ 0.2 = n × (1.6 × 10‾¹⁹)

➙ n = 0.2/1.6 × 10¹⁹

➙ n = 0.125 × 10¹⁹

➙ n = 1.25 × 10¹⁸ electrons