Question

How much work is done in moving a charge of 4c across two points having potential difference
of 14 v. calculate the member of elections flowing
in it​

Answer 1

Work done by body is 56 J.

Number of electrons flowing = 2.5 × 10^(19)

Solution

We have,

Charge across two points = 4c

Potential difference = 14 V

Work done = ?

We know,

Work done = Potential difference × Charge

⇒ Work done = 14 × 4

⇒ Work done = 56 J

∴ Work done by body = 56 Joule.

Now we have,

Charge (Q) = 4c

Charge of electron (e) = 1.6 × 10^(-19)

Number of electrons = ?

We know,

Charge = Number of electrons × Charge in electron.

⇒ 4 = n × 1.6 × 10^(-19)

⇒ n = 4/(1.6 × 10{-19})

⇒ n = 2.5 × 10^(19)

∴ Number of electrons flowing = 2.5 × 10^(19)

Answer 2

Answer:

Explanation:

Given :-

Charge across two points = 4c

Potential difference = 14 V

We know that,

Charge of electron = 1.6 × 10⁻¹⁹ C

To Find :-

Work done

Number of electrons.

Formula to be used :-

Work done = Potential difference × Charge

Charge = Number of electrons × Charge of electron

Solution :-

Putting all the values, we get

⇒ Work done = 14 × 4

⇒ Work done = 56 J

Hence, the work done in moving charge is 56 J.

Now, Number of electrons

Charge = Number of electrons × Charge of electron

⇒ 4 = Number of electrons × 1.6 × 10⁻¹⁹

⇒ Number of electrons = 4/1.6 × 10⁻¹⁹

⇒ Number of electrons = 2.5 × 10¹⁹

Hence, the Number of electrons is 2.5 × 10¹⁹.