An isolated point charged point particle produces an electric field with magnitude E at a point 2 m away from the charge. A point at which the field magnitude is E/4 is:
A) 1 m away from the charge
B) 0.5 m away from the charge
C) 2 m away from the charge
D) 4 m away from the charge
E) 8 m away from the charge

Question

Quizplus · Accepted Answer

The electric field magnitude due to a point charge decreases with the square of the distance from the charge (E ∝ 1/r²). If the field magnitude is E at 2 m, then for the field to be E/4, the distance must be doubled to 4 m (since (1/4)E = kQ/(4r²)).

An Isolated Point Charged Point Particle Produces an Electric Field