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Two identical charges +Q are kept fixed ...

Two identical charges `+Q` are kept fixed some distance apart.A small particles `P` with charge `q` is placed midway between them . If `P` is given a small displacement `Delta` ,it will undergo simple harmonic motion if
(i) `q` is positive and `Delta` is along the line joining the charges
(ii) `q` is positive and `Delta` is perpendicular to the line joining the charges
(iii) `q` is negative and `Delta` is perpendicular to the line joining the charges
(iv) `q` is positive and `Delta` is along the line joining the charges

A

`q` is positive and `D` is along the line joining the charges

B

`q` is positive and `D` is perpendicular to the line joining the charges.

C

`q` is negative and `D` is perpendicular to the line joining the charges.

D

`q` is negative and `D` is along the line joining the charges.

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The correct Answer is:
A,C
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