Two point particles, with charges of q1 and q1 are placed a distance r apart. The electric field is zero at a point P between the particles on the line segment connecting them. We conclude that: (answer C - why)
a) q1 and q2 must have the same magnitude and sign
b) P must be midway between the particles.
c) q1 and q2 must have the same sign but may have different magnitudes.
d) q1 and q2 must have equal magnitudes and opposite signs.
e) q1 and q2 must have opposite signs and may have different magnitudes.
Two point particles, 1 with charge +8*10^-9C and the other with charge -2*10^-9C, are separated by 4m. The electric field in N-C midway between them is:
(Answers = 22.5 - WHY?)