Charge q is place exactly in the centre of two charges Q each as shown in figure. A demonstrator in a TV Show slightly displaces q along perpendicular bisector the charge q executes SHM. He then displaces it axially. Charge q again execute SHM with a different time period.
He then took out a sphere in which a tunnel was carved out along the diameter. He charged the sphere and took a small particle (charged) q. He allowed the charge particle to fall in tunnel. The charged particle executed SHM. He posed the following questions.
What is the nature of charge on q with respect to Q?
![153240_375ddd7e978549f4957f4bb380c5ac5e.png](https://search-static.byjusweb.com/question-images/toppr_ext/questions/153240_375ddd7e978549f4957f4bb380c5ac5e.png)