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Homework Statement
Immediately outside a very long cylindrical wire of radius Ri = 0.5 mm, the electric field (in air) is E = 40 kV/m,
away from the wire’s surface. Use clearly labelled diagrams, explain any principle/law used, for all parts.
a) What is the charge per unit length along the wire?
The attempt at a solution
I'm not sure which formula I should apply, can somebody direct me?
Immediately outside a very long cylindrical wire of radius Ri = 0.5 mm, the electric field (in air) is E = 40 kV/m,
away from the wire’s surface. Use clearly labelled diagrams, explain any principle/law used, for all parts.
a) What is the charge per unit length along the wire?
The attempt at a solution
I'm not sure which formula I should apply, can somebody direct me?