Write an expression for the electric field intensity E at a distance d from a charge Q. - Leaving Cert Physics - Question g - 2018

The electric field intensity E due to a point charge Q at a distance d is given by the formula:

$E = \frac{Q}{4\pi \epsilon_0 d^2}$

where:

• Q is the charge,
• $\epsilon_0$ is the permittivity of free space, and
• d is the distance from the charge to the point where the electric field is measured.

This formula indicates that the electric field intensity decreases with the square of the distance from the charge.