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Callix
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Homework Statement
A positively charged wire is bent into a semicircle of radius R, as shown in the figure below.
The total charge on the semicircle is Q . However, the charge per unit length along the semicircle is non-uniform and given by λ=λocos(θ)
What is the relationship between λo, R and Q?
Homework Equations
Q = ∫ λ ds
F = qE
The Attempt at a Solution
Q = ∫ λ ds = ∫(from θ=0 to π) λocos(θ) dθ.
However, this yields evaluating the sin function from 0 to π which is just 0. I'm having a hard time believing that there is no relationship between λ, R, and Q. I was wondering if someone would be able to check my work.
Any help would be greatly appreciated! :)