1.

When glass rod is rubbed against silk, silk becomes negatively charged of 320 nC, then how much electrons lost by the glass rod ?

Answer»

(A) `2 xx 10^(10)`
(B) `2 xx 10^(11)`
(C) `2 xx 10^(12)`
(D) `5.12 xx 10^(-26)`

Solution :`Q = -320 nC = -320 xx 10^(-9) C`
`e = -1.6 xx 10^(-19)` C
Q = ne
`-320 xx 10^(-9) = N xx (-1.6 xx 10^(-19))`
`THEREFORE n = (320 xx 10^(-9))/(1.6 xx 10^(-19)) = 2 xx 10^(12)`


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