Question

Two point charges Q and -3Q are placed some distance apart. If the electric field at the location of Q is E, find the electric field at the location of -3Q.

Answer 1

Given the Electric field at the location of Q = E

We can write,

Electric field due to charge at the location of Q due to charge -3Q

$E=K\frac{3Q}{r^2}$ ------(1)

The electric field at the location of 3Q due to the charge Q

$E_1=K\frac{Q}{r^2}$ -------(2)

From the equation 1 and equation 2, we can say that

The electric field at the location of -3Q is one-third of the electric field at the location of Q