Question

Question #b7787

Answer 1

EMU: Electromagnetic Unit
ESU: Electrostatic Unit - statcoulomb (statC)

Explanation:

ESU
1 statC =dyn1/2 cm= cm3/2 g1/2 s−1.
It can be converted using
1 newton = 105 dyne
1 cm= 10^(-2)m

The SI system of units uses the coulomb (C) instead. The conversion between C and statC is different in different contexts. The most common contexts are:

For [electric charge](https://socratic.org/physics/electric-forces-and-fields/electric-charge):

    1 C ↔ 2997924580 statC ≈ 3.00×109 statC
    ⇒ 1 statC ↔ ~3.33564×10−10 C.

For electric flux (ΦD):

    1 C ↔ 4π×2997924580 statC ≈3.77×1010 statC
    ⇒ 1 statC ↔ ~2.65×10−11 C.

https://en.wikipedia.org/wiki/Statcoulomb

The ESU and EMU subsystems of CGS are connected by a fundamental relationship. Therefore, the ratio of the corresponding "primary" electrical and magnetic units (e.g. current, charge, voltage, etc. – quantities proportional to those that enter directly into Coulomb's law or Ampère's force law) is equal either to `c^−1` or c.

https://en.wikipedia.org/wiki/Centimetre%E2%80%93gram%E2%80%93second_system_of_units#Electromagnetic_units_.28EMU.29