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Question

Gauss's law should be invalid if


  1. The velocity of light were not a universal constant

  2. There were magnetic monopoles

  3. The inverse square law were not exactly true

  4. None of these


Solution

The correct option is C

The inverse square law were not exactly true


If the inverse square law were not true, Electric field would not decrease in proportion to increase in surface area of a sphere(with increase in radius.) 

E α 1r2
A α r2

So ϕ does not change if the gaussian surface changes.

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