$\sqrt{60} \mathrm{~V} / \mathrm{m}$

$\sqrt{30} \mathrm{~V} / \mathrm{m}$

$\sqrt{50} \mathrm{~V} / \mathrm{m}$

$\sqrt{40} \mathrm{~V} / \mathrm{m}$

Photons carry some momentum because, they have a finite rest mass.

Electromagnetic force is weaker than weak nuclear force but stronger than gravitational force.

Weak nuclear force is responsible for the stability of nuclei.

Electromagnetic force acts over large distances and does not need any intervening medium.

$10^{-10} \mathrm{~m}$

$10^{-15} \mathrm{~m}$

$10^{-6} \mathrm{~m}$

$10^6 \mathrm{~m}$

$+x$-direction

$-x$-direction

$+z$-direction

$-z$-direction