Question

3. How much work is done in moving a body carying charge equivalent to that on 5 x 10-19
electrons from infinity to a point at 40 volts?
(2 Points)
​

Answer 1

120J

Explanation:

potential difference=V= (40-25)volts+ 15volts

no. of electrons= 5 x 10^19

charge of one electron= 1.6 x 10^-19

total charge=Q = 5 x10^19 x 1.6 x 10^-19= 8 coulombs

to find= work done = W

V=W/Q

therefore, W= VQ

W = (8 x 15)J =120J Ans

Answer 2

120J

Explanation:

potential difference=V= (40-25)volts+ 15volts

no. of electrons= 5 x 10^19

charge of one electron= 1.6 x 10^-19

total charge=Q = 5 x10^19 x 1.6 x 10^-19= 8 coulombs

to find= work done = W

V=W/Q

therefore, W= VQ

W = (8 x 15)J =120J Ans..