Two point charges +4 µC (at A) and –1 µC (at B) are separated by 12 cm in air. Determine the distance from A along AB where the resultant electric field is zero.
a) 4 cm from A toward B
b) 8 cm from A toward B
c) No such point exists between A and B
d) 24 cm from A toward B (i.e., 12 cm beyond B)