There exists an electric field of magnitude $E$ in $x$-direction. If the work done in moving a charge of $0.2 \,C$ through a distance of $2 \,m$ along a line making an angle $60^{\circ}$ with $x$-axis is $4 \,J$, then the value of $E$ is ........ $N / C$
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(d)
$W=q E d \cos \theta$
$4=(0.2)(E)(2) \frac{1}{2}$
$E=20 \,N / C$
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