Question

Two point charges of `1muC and -1muC` are separated by a distance of 100 Å. A point P is at a distance of 10 cm from the midpoint and on the perpendicular bisector of the line joining the two charges. The electric field at P will be
A. `9NC^(-1)`
B. `0.9NC^(-1)`
C. `90NC^(-1)`
D. `0.09NC^(-1)`

Answer 1

Correct Answer - D
The point lies on equatorial line of a short dipole.
`therefore" "E=(2ql)/(4piepsilon_(0)r^(3))=(9xx10^(9)xx10^(-6)xx10^(-8))/((10^(-1))^(3))=0.09NC^(-1)`