1.

A charge on electron is 1.6 xx 10^(-19) C. How many electrons will be passing in 2 seconds through a cross-section of a conducting wire carrying 0.7 A electric current ?

Answer»

4.4 `xx 10^(18)`
`4.4 xx 10^(-18)`
`8.8 xx 10^(18)`
`8.8 xx 10^(-18)`

Solution :`8.8 xx 10^(18)`
`I = (Q)/(t) = ("NE")/(t)`
` therefore n = (I t)/(E) = (0.7 xx 2)/(1.6 xx 10^(-19))= 0.875 xx 10^(19)`
`therefore n APPROX 8.8 xx 10^(18)`


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