A very long straight wire has charge per unit length 1.49×10-10 C/m.(adsbygoogle = window.adsbygoogle || []).push({});

At what distance from the wire is the magnitude of the electric field equal to 2.49 N/C?

Use 8.85×10-12 C^2/(N*m^2) for the permittivity of free space and use pi = 3.1416 for E = (lambda)/(2*pi*permittivity of free space*r).

Given:

E = 2.49 N/C

I have no idea what to do with this formula. Why is wavelength needed and what is the variable we are trying to find? I am lost.

Thanks.

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# Wire in Field

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