1.

The plates each of area A of a parallel plate caoacitor are given charges Q and -Q. The plates are joined by a non-conducting spring of force constant k. The natural length of the spring is d, the inital separation between the plates. The left plate is connected to a vertical wall through a massless non-conducting rope and the right plate is connected to ablock of mass m through similar rope. Assume the pulley to be massless, neglect dielectric effect of the spring and Q^(2) lt 2mAepsilon_(0)g If T be the time period of oscillation, then

Answer»

`T gt 2pisqrt((m)/(k))`
`T lt 2pisqrt((m)/(k))`
`T = 2pisqrt((m)/(k))`
`T` will DEPEND on `Q`.

SOLUTION :`MG` is balanced by the ELECTROSTATIC force.


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