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 Q^(2)=2mAepsilon_(0)g, the elongation of the string is

The plates each of area A of a parallel plate caoacitor are given char

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 Q^(2)=2mAepsilon_(0)g, the elongation of the string is
Answer» zero `(2)/(k)(mg-(Q^(2))/(Aepsilon_(0)))` `(2)/(k)(2mg-(Q^(2))/(Aepsilon_(0)))` NONE of these Solution :USE force BALANCE.

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