Surface charge density is a measure of the electric charge per unit area on a surface. It is represented by the symbol σ and is typically measured in units of coulombs per square meter.
Surface charge density is directly proportional to the electric field on a surface. The higher the surface charge density, the stronger the electric field will be.
The electric field on a disk can be found by using the formula E = σ/ε0, where E is the electric field, σ is the surface charge density, and ε0 is the permittivity of free space.
Surface charge density is typically measured in units of coulombs per square meter (C/m2).
Surface charge density can be experimentally determined by measuring the total charge on a surface and dividing it by the surface area. This can be done using a device called an electrometer.