Two point charges Q and -3Q are placed some distance apart. If the electric field at the location of Q is $\vec{E}$ , the field at the location of -3Q is

Q: Two point charges Q and -3Q are placed some distance apart. If the electric field at the location of Q is $\vec{E}$ , the field at the location of -3Q is

(a) $\vec{E}$

(b) $-\vec{E}$

(c) $+\vec{E}/3$

(d) $-\vec{E}/3$

Ans: (C)