An electric field is expressed as ` vec E = ( 5 hati + 3 hatj + 2 hatk ) ` unit. Find out the electric flux across an area of 200 unit on the yz - plane in the field.

Explanation

The yz - plane is perpendicular to the x - axis
` therefore ` The given area vector is ` vecS = 200 hati ` unit.
Then, the electric flux across that area,
` phi = vec E * vec S = ( 5 hati + 3 hatj + 2 hatk ) * 200 hati = 1000 ` unit.