Question

The electric flux across a rectangular surface of area a is placed in uniform electric field making an angle 60 degree with its surface is,
a) 2ea
b)root3ea/2
c)ea
d)ea/2
answer is option b.pls explain how?

Answer 1

Answer:

Explanation:  Ф= E.Acos∅     ∅ is angle b/w them

         then, Ф = ea.1/2

Answer 2

Answer:

$\frac{\sqrt3Ea}{2}$

Explanation:

If the plane of the rectangle is at $60^\circ$ with the field then the perpendicular to the plane is at $30^\circ$ to the field.

Electric Flux $\phi = EAcos\theta$$= EA cos 30 =$ $\frac{\sqrt3Ea}{2}$