Electric Charges and Fields - Result Question 38
38. A square surface of side $L$ meter in the plane of the paper is placed in a uniform electric field $E$ (volt $/ m$ ) acting along the same plane at an angle $\theta$ with the horizontal side of the square as shown in Figure. The electric flux linked to the surface, in units of volt. $m$, is
[2010]
(a) $EL^{2}$
(b) $EL^{2} \cos \theta$
(c) $EL^{2} \sin \theta$
(d) zero
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Answer:
Correct Answer: 38. (d)
Solution:
- (d) Electric flux, $\phi=E A \cos \theta$, where $\theta$ $=$ angle between $E$ and normal to the surface.
Here $\theta=\frac{\pi}{2}$
$\Rightarrow \phi=0$
