The electric filed lines on the left ...

The electric filed lines on the left have twice the sepration on those on the right as shown in figure . If the magntiude of the filed at A is `40 Vm^(-1)` .what is the force on ` 20 mu C` charge kept at B ?

`1 xx 10^(-4) N`

`4 xx 10^(-4) N`

`8 xx 10^(-4) N`

`16 xx 10^(-4) N`

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