1.

Two points P and Q are maintained at the potentials of 10 V and - 4 V respectively. The work done in moving 100 electrons from P to Q is

Answer»

`9.60 XX 10^(-17) J`
`-2.24 xx 10^(-16) J`
`2.24 xx 10^(-16)J`
`-9.60 xx 10^(-17) J`

Solution :Here charge of 100 ELECTRONS `q = ne = 100 xx (-1.6 xx 10^(-19)) C = - 1.6 xx 10^(17)C`
Work done `W_P^Q = q (V_Q - V_P) = (-1.6 xx 10^(-17)) [ (-4V)-(10V)] = + 2.24 xx 10^(-16)J`


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