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The magnitude of point charge due to whi...

The magnitude of point charge due to which the electric field 30 c away has the magnitude `2"N C"^(-1)` will be

A

`2xx10^(-11)C`

B

`3xx10^(-11)C`

C

`5xx10^(-11)C`

D

`9xx10^(-11)C`

Text Solution

Verified by Experts

The correct Answer is:
A
`E=(kq)/r^(2)`
`q=(Er^(2))/k=(2xx(0.3)^(2))/(9xx10^(9))`
= `(2xx9xx10^(-2)xx10^(-9))/9`
`thereforeq=2xx10^(-11)C`
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