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## Homework Statement

A proton orbits a long charged wire, making 1.30*10^6 revolutions per second. The radius of the orbit is 1.20cm.

What is the wire's linear charge density?

## Homework Equations

- q E = m w^2 r

- 9*10^9 [2 λ /r] q = m w^2 r

## The Attempt at a Solution

λ = linear charge dens

w = 2pi/period = 2pi/T

w = d theta/dt = 1.4* 2pi /1

I'm confused on how to solve for λ here though. Can anyone help me out?