Question

2) Calculate the number of electrons that
could flow per second through the cross
section of a wire when 4 A current flows in
it?

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Answer 1

Given :-

Current ,I = 4 A

Time taken ,t = 1 s

To Find:-

No. of electrons

Solution:-

Firstly we calculate the Charge Flows through the wire .

As we know relationship between Current , Time & Charge

• I = Q/t

substitute the value we get

→ 4 = Q/1

→ Q = 4 C

Charge through the wire is 4 coulomb.

Now, Calculating the Number of electrons.

Using Formula

• Q = ne

where ,

Q is the Charge

n is the number of electrons

e is the charge of electron ( 1.6 × 10⁻¹⁹ )

Substitute the value we get

→ 4 = 1.6×10⁻¹⁹ × e

→ e = 4/1.6×10⁻¹⁹

→ e = 4×10¹⁹/1.6

→ e = 2.5 × 10¹⁹

Therefore, the number of electrons is 2.5×10¹⁹ electrons.

Answer 2

Answer:

4=1.6×10ki power 19×e

e=4/1.6×10ki power 10

e=2.5×10ki power 9