Question

1. Two points P and Q are maintained at the potentials of 10 V and 4 V respectively. The work in moving
100 electrons from P to Q is
42.
2.24 x 10-16
(B) -2.24 x 10-16
(C)-9.60 x 10-17
(D) 9.60 x 10-17)​

Answer 1

ɢɪᴠᴇɴ:

• Two points P and Q are maintained at a potential difference of 10V and 4V .

ᴛᴏ ғɪɴᴅ:

• The work done in moving 100 electrons from P to Q .

ᴀɴsᴡᴇʀ :

We know that work done equals to

★ Work done = q ( V - v ) ★

where ( V - v ) is the difference of potential at two points and q is the charge.

Now charge on one electron is 1.6 × 10^ -19 C .

Hence charge on 100 electrons

= 1.6 × 10^-19 × 100.

= 1.6 × 10^-17.

Here we are taking charge from P to Q ,so Potential difference will be (4 - 10 ) V = -6V .

On putting the respective values ,

=> W = q ( V - v ).

=> W = 1.6 × 10^-19 C × -6 V

=> W = -9.6 × 10^ -19 J

Hence the work done is -9.6 × 10^-19 J .