Question

Gauss's law should be invalid if

• A. There were magnetic monopoles
• B. The inverse square law were not exactly true
• C. The velocity of light were not a universal constant
• D. None of these

Answer 1

The correct option is B

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.)

$E\alpha \frac{1}{r^2}$
$A\alpha r^2$

So $\varphi$ does not change if the gaussian surface changes.