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## Main Question or Discussion Point

Hello everyone,

I'd like to know if my understanding of local and integral quantities is clear.

An integral quantity refers to the entire physical system, it is not defined point by point.

A local one is defined point by point, for example ρ(x,y,z).

Can I consider the charge dq as a local quantity? It is the charge of an infinitesimal element of something.

I can integrate it and find the integral quantity q.

In some quizzes my prof asks to write three or four local and integral quantities.

Integral quantities could be mass, electric potential, resistance, charge.

Local quantities could be resistivity, electric field, density or the density of current.

I'm not sure if I can consider local quantities the differential quantities like dL, dm, dq, di, dV. The correspondent integral ones are lenght, mass, charge, intensity of current, potential.

Thank you for your answers

I'd like to know if my understanding of local and integral quantities is clear.

An integral quantity refers to the entire physical system, it is not defined point by point.

A local one is defined point by point, for example ρ(x,y,z).

Can I consider the charge dq as a local quantity? It is the charge of an infinitesimal element of something.

I can integrate it and find the integral quantity q.

In some quizzes my prof asks to write three or four local and integral quantities.

Integral quantities could be mass, electric potential, resistance, charge.

Local quantities could be resistivity, electric field, density or the density of current.

I'm not sure if I can consider local quantities the differential quantities like dL, dm, dq, di, dV. The correspondent integral ones are lenght, mass, charge, intensity of current, potential.

Thank you for your answers