1.

One body has 2.5 xx 10^13 protons. Now if i carries -2muc charge then how many electron are there on this body ?

Answer»

<P>(A) `1.25 XX 10^(13)`
(B) `2.5 xx 10^(13)`
(C) `3.75 xx 10^(13)`
(D) none of above.

Solution :SUPPOSE there are `n_(e)` electrons in a body.
`therefore q = n_(e)e^(-) + n_(p)e^(+)`
`therefore -2 xx 10^(-6) = n_(e)(-1.6 xx 10^(-19)) + 2.5 xx 10^(13) xx 1.6`
`therefore n_(e) = (6 xx 10^(-6))/(1.6 xx 10^(-19)) = 3.75 xx 10^(13)`


Discussion

No Comment Found

Related InterviewSolutions