Question

What is the magnitude of the electric field at a radius r < r?

A) Zero
B) Infinite
C) Cannot be determined
D) Decreases with increasing r

Answer 1

The magnitude of the electric field at a radius less than r is zero.

Step-by-step explanation:

Answer:

The magnitude of the electric field at a radius less than r is

A) Zero

. When r < r, the electric field is zero because the electric field decreases with increasing distance. As stated in the question, the electric field decreases proportionally to 1/r, and when r < r, the electric field is essentially non-existent. In this case, since r < r, the magnitude of the electric field is zero.

For example, if we consider a point charge, the electric field decreases with distance squared from the charge, so when we are closer to the charge, the magnitude of the electric field is greater. But when we are inside the charge (r < r), the electric field is zero since the distance from the charge is essentially zero.