1.

Charge on electrons having total mass of 75 kg is ......C.

Answer»

`-1.32 xx 10^(13)`
`-6.25 xx 10^(18)`
`-1.25 xx 10^(13)`
`-1.6 xx 10^(19)`

Solution :Mass M = `m_(e)N` where `m_(e) = 9.1 xx 10^(-31)` KG
`therefore n = M/m_(e) = 75/(9.1 xx 10^(-31))`
`therefore n=8.24 xx 10^(31)`
And electric charge
Q = ne
`=8.24 xx 10^(31) xx (-1.6 xx 10^(-19))`
`=-13.184 xx 10^(12)`
`=-13.2 xx 10^(13)` C


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