A smooth, isolated metallic sphere of mass is suspended by an insulating thread. It…
PHYSICS · Subjective · AP · Physics 2: Algebra-based · Electric Force Field and Potential · Electric Force Field and Potential
Problem
A smooth, isolated metallic sphere of mass 50g is suspended by an insulating thread. It is charged by contact with a negatively charged rod so that 5.0×1011 electrons are deposited on it.
(i) Calculate the charge acquired by the sphere.
(ii) The charged sphere is then touched to an identical uncharged sphere and separated. Find the final charge on each sphere and the number of electrons that move during the contact.
(iii) The second sphere is now momentarily connected to the Earth (earthed) and then disconnected. Assuming no other interactions, determine the final charge on the first sphere after this sequence of operations.