Given are four arrangements of three fixed electric charges. In each arrangement, a point labelled `P` is also identified- test charge, `+q`, is placed at point `P`. All of the charges are of same magnitude `Q`, but they can be either positive or negative as indicated. The charges and point `P` all lie on a straight line. The distances between adjacent items, either between two charges or between a charge and point `P`, all are the same. Compare forces on +q in each case.

Options

A. `II gt I gt III gt IV`
B. `IgtIIgtIIIgtIV`
C. `IIgtIgtIVgtIII`
D. `IIIgtIVgtIgtII`

Answer

C

Explanation

In (I) and (II), forces on `P` due to all three charges are in same directions, but in case (II) distances are minimum.
Hence forces `(IIgtI)`.
In case`(III)` force on `P` will be towards left and in `(IV)`, force will be toward right. But on calculation forces `(IVgtIII)`.