PHYSICS · Single correct · AP · Physics 2: Algebra-based · Electric Force Field and Potential · Electric Force Field and Potential
Problem
Three charges +4q, Q and q are placed in a straight line of length ℓ at points at distance 0, ℓ/2 and ℓ respectively from one end of line. What should be the value of Q in order to make the net force on q to be zero?
(a) −q
(b) −2q
(c) −q/2
(d) 4q