Prakash Gautam
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 Dec 22 comment If everything in the universe doubled in size overnight, would it be noticeable? Objects expand on heating. If a circular object with circular hole is heated, both the radius of hole and the object increase. Nov 9 comment Find the quantity of charge - given potential function Sorry I am not much aware of delta function. Keeping $\delta(\vec r)$ in the result keeps the work of taking Laplacian still intact. So why should I prefer using $\delta(\vec r)$ in my answer of charge density? Nov 9 comment Find the quantity of charge - given potential function Sorry I missed out $\lambda$ in my equation I've now edited that Oct 31 comment Time dilation $t'=(1-\frac{v}{c})t$ instead of $t'=\frac{1}{\gamma} t$ Thank you for your answer. But, Why wouldn't the observer on the train not agree that the distance between him and the photon is $ct-vt$? Jun 15 comment Nature of orbit due to central force! Sorry angular momentum is conserved...