Physics-
General
Easy

Question

One plate of a capacitor is connected to a spring as shown. Area of both the plate is A and separation is d when capacitor is uncharged. When capacitor is charged, in steady state separation between the plates is 0.8d. The force constant of the spring is :

  1. fraction numerator epsilon subscript 0 end subscript A E to the power of 3 end exponent over denominator 2 d to the power of 3 end exponent end fraction    
  2. fraction numerator 2 epsilon subscript 0 end subscript A E over denominator d to the power of 2 end exponent end fraction    
  3. fraction numerator 6 epsilon subscript 0 end subscript E to the power of 2 end exponent over denominator A d to the power of 3 end exponent end fraction    
  4. fraction numerator 4 epsilon subscript 0 end subscript A E to the power of 2 end exponent over denominator d to the power of 3 end exponent end fraction    

The correct answer is: fraction numerator 4 epsilon subscript 0 end subscript A E to the power of 2 end exponent over denominator d to the power of 3 end exponent end fraction

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