Question

There is a uniform electric field in X-direction. If the work done in moving a charge of 0.2 C
through a distance of 2 metre along the line making an angle of 60 with X-direction is 4 joule,
then the value of E is:

• A. $\sqrt{3}N/C$
• B. $4N/C$
• C. $5N/C$
• D. $20N/C$

Answer 1

The correct option is D $20N/C$

$W=4J$

$d=2m$

$q=0.2C$

$\theta =60°$

$W=Fd\cos \theta$

$=qEd\cos \theta$

$\therefore E=\frac{W}{qd\cos \theta }$

$=\frac{4}{2\times 0.2\times \frac{1}{2}}$

$=20N/C$