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  4. There is an electric field 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 of 60° with x -axis is 4 J , the value of E is:

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Q. There is an electric field $E$ 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 of $60^{\circ}$ with $x$ -axis is $4 J ,$ the value of $E$ is:

Electric Charges and Fields

Solution:

$W=$ Fs $\cos \theta$
$F = qE$
$E=\frac{F}{q}=\frac{W}{q s \cos \theta}$
$=\frac{4}{0.2 \times 2 \cos 60^{\circ}}$
$=20 N / C$