Question

A circular disc of radius 'r' is placed along the plane of paper. A uniform electric field `vec"E"` is also present in the plane of paper. What amount of electric flux is associated with it?

Options

• Eπr²

• Zero

• 2Eπr

• `(pi"r"^2"q")/"E"`

Answer 1

Zero

Explanation:

Since no electric lines of force are travelling through it, the flux is zero. Additionally, since the electric lines of force are perpendicular to the disc's area plane, the relation predicts that the flux will also be zero in this case.

`phi = "E"*"A" cos theta (cos theta = 90^circ = 0)`