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Coulomb's Law and Electric fields
- Charge is quantified and measured in Coulombs ($C$).
- 1 Coulomb is the charge carried by 1 Amp in 1 second.
- $1.60\times 19^{-19}$ is the charge on a proton/electron.
Electric fields
- Direction of force on a positive test charge. I.e. if you placed a positive charge, where would it go?
Electric field strength formula: $E=\frac{F}{q}=\frac{V}{d}$
Where:
- $E$: electric field strength
- $F$: force $(N)$
- $q$: charge $(C)$
- $V$: voltage $(V)$
- $d$: distance between charge $(m)$
Hence, the units of $E$ is $NC^{-1}$ OR $Vm^{-1}$
Note these are separate drawings. If they weren't, the charge fields would interact with each other.
- Different charges shift the central line.
- If it was two negative charges, the arrows would go the other way.
