Q. There is an electric field $E$ in $X$-direction. If the work done on moving a charge $0.2\ C$ through a distance of $2m$ along a line making an angle $60{^\circ}$ with the $X$-axis is 4.0, what is the value of $E$

A) $\sqrt{3}N/C$
B) $4N/C$
C) $5\ N/C$
D) None of these
Explanation

(d) $W = qV = qE.d$
$\Rightarrow 4 = 0.2 \times E \times (2\cos{60{^\circ}})$
$= 0.2\ E \times (2 \times 0.5)$
$\therefore E = \frac{4}{0.2} = 20\ NC^{- 1}$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.