# Dirac Delta function and charge density.

by calcisforlovers
Tags: charge, delta, density, dirac, function
 P: 7 I have a line charge of length L and charge density /lambda on the Z-axis. I need to express the charge density in terms of the Dirac Delta function of theta and phi. How would I go about doing this?
 P: 455 $$\rho=\lambda\delta(1-\cos\theta)U(L-r))/(2\pi r^2)$$, where U is the unit step function, should be the charge density in spherical coordinates.

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