A proton at speed v = 3.00 × 105 m/s orbits at radius r = 1.00 cm outside a charged sphere. Find the sphere’s charge.

Question

A proton at speed v = 3.00 &times;105 m/s orbits at radius r = 1.00 cm outside a charged sphere. Find the sphere&rsquo;s charge.

MisterLuke · Answer

Using the formulae for centripetal force and electrostatic force, the charge on the sphere comes to about 1.05*10^-9 Coulombs