Homework Statement
In a photoelectric-effect experiment, light of wavelength (x) nm is incident on a sample of sodium. The work function of sodium is (y) J. Calculate the stopping potential required to just stop all electrons from reaching the anode.
Homework Equations
To work out...
Hi. That's on the same vein as the one I asked a few threads ago. Find the equation that shows the magnitude B or a magnetic field at a distance r (clue: it's the one with the permeability of free space constant in). Hope that helps
Homework Statement
This is a two part question I just want to check I'm on the right track - it just seems too easy to be worth the marks they're given so apologies now if I'm stating the obvious:
a) Write down an equation for the magnitude B of the magnetic field at a distance D away in...