Question

If the surface is placed parallel to the electric field, then

• A. infinite electric flux will pass through the surface.
• B. no electric flux will pass through the surface.
• C. finite electric flux will pass through the surface.
• D. variable electric flux will pass through the surface.

Answer 1

The correct option is B no electric flux will pass through the surface.

The electric field through the surface is given by $\varphi =\Phi \overrightarrow{E}.\overrightarrow{dS}$

$E=$ electric field.

$dS=$ area element on the surface.

$\overrightarrow{E}.\overrightarrow{dS}=EdS\cos \theta$

where $\theta =$ angle between electric field and normal to surface.

So, if electric field is placed parallel to the surface then,

$\theta ={90}^{\circ }$

then, $\overrightarrow{E}.\overrightarrow{dS}=0$

So, flux through the surface, $\varphi =0$