1. A –Level Physics: Coulomb’s Law

2. Objectives:

3. FLASHBACK
FLASHBACK: Explain the evidence supporting a) light as a wave and b) light as a particle. [8 marks]

4. Starter Activities Draw the interactional electric fields between:
2 positive spheres
1 positive and 1 negative sphere
A positive plate and a negative sphere
2) Explain why the equipotentials around a radial electric field get further apart as you get further away from the charged sphere
3) State all equations relating to radial electric fields

5. Remembering that εo is the permeability of a vacuum (8.85x10-12Fm-1 )
Coulomb’s Law
Attraction between a proton and an electron can be thought of as an electron feeling a force produced by the proton’s electric field (or vice versa).
F= 𝑄1𝑄2 4𝜋∈𝑜𝑟2
Remembering that εo is the permeability of a vacuum (8.85x10-12Fm-1 )
The force between two charged objects (such as a proton and electron), named here as Q1 and Q2, that are separated at a distance, r, is described by Coulomb’s law
5.1 x N
A helium nucleus has charge +2e and a neon nucleus +10e, where e = 1.60 x coulombs. With what force do they repel each other when separated by 3 x 10-9 meters?

6. Complete the question sheet provided on Coulomb’s Law
Practice
Complete the question sheet provided on Coulomb’s Law
When completed, collate all the information you have covered about electric fields onto a single sheet. Include ALL equations!
See pg 34/35