can anyone help with this?(adsbygoogle = window.adsbygoogle || []).push({});

a small point mass m carries a charge q. it is constrained to move vertically inside a narrow, frictionless cylinder. at the bottom of the cylinder is another point mass of Charge Q, same sign as q. the charge q is released from a height H and is observed to fall vertically downwards until it comes to rest for the first time at a vertical height h above Q. the charge then oscillates vertically. show that the motion will be simple harmonic if H-kqQ/(mgH) is much less than ((kqQ)/(mg))^.5. and the frequency will equal 4((mg^3)/(4pi^4kqQ)).

thanks, have been able to show h = kqQ/(Hmg)

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Electrical forces

**Physics Forums | Science Articles, Homework Help, Discussion**