First slide

Electrostatic potential

Question

There is an electric field E in X-direction. If the work done on moving a charge 0.2C through a distance of 2 m along a line making an angle 60 ° with the X-axis is 4.0 J, what is the value of E?

Moderate

A

$\sqrt{3} N / C$
B

4 N/C
C

5 N/C
D

None of these

Solution

W = qV = qE.d
⇒ 4= 0 .2 X E X (2 cos 60°)
= 0.2 EX (2 X 0.5)
$E = \frac{4}{0.2} = 20 {NC}^{- 1}$

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