Why do we take the value of the constant in Coulomb's law as $\frac{1}{4\pi\varepsilon_0}$?
69293
Physical dimensions for the Coulomb force in SI and CGS
106828
If $0 \lt x \lt \frac{\pi}{2}$, is $\cos(x) \le \frac{\sin(x)}{x} \le \frac{1}{\cos(x)}$?
80045
Can someone give an intuitive way of understanding why Gauss's law holds?
69776
Why is the diode forward voltage constant?
98741
Finding $\int_{0}^{\frac{\pi}{4}} \frac{\tan \theta - \tan^3 \theta}{\ln \tan \theta}$
146666
Intuitive reason for the $T^4$ term in Stefan Boltzmann law
83262
Why is there a factor of $4\pi$ in certain force equations?
113526
Why intuitively does $\mathbb E(\frac d {d\theta}\log p_\theta(x))=0$?
31922
Integral of $\sin x \cos x$ using two methods differs by a constant?
48966
Gauss's law in a uniform charge distribution extending infinitely in all directions
6848
The strange thing about the maximum in Planck's law
102954
Gauss law and electric flux
124391
Correlation with a constant
119324
In terms of the Ampere-Maxwell law, why is $\vec {E}=0$ in a wire of a capacitor circuit?
19561
Why is $\frac{1}{\frac{1}{X}}=X$?
146358
Why is there a $\frac 1 2$ in $\frac 1 2 mv^2$?
43385
Why is $\frac{\operatorname dy'}{\operatorname dy}$ zero, since $y'$ depends on $y$?