Question

The intensity of electric field required to balance a proton of mass `1.7xx10^(-27)kg` and chrage `1.6 xx 10^(-19) C` is nearly
A. `1xx10^(-7)V//m`
B. `1xx10^(-5)V//m`
C. `1xx10^(7)V//m`
D. `1xx10^(5)V//m`

Answer 1

Correct Answer - a
Since `qE = mg` or `E= (mg)/(q)= (1.7xx10^(-27)xx9.8)/(1.6xx10^(-9))`
`=10.0xx10^(-8)= 1xx10^(-7)V//m`