two small spheres spaced 20.0cm apart have equal charges.How many excess electrons must be present on each sphere if magnitude of the force of repulsion betweeen them is 3.33*10-21 N
A proton is placed in a uniform electric field of Calculate:
a) the magnitude of the electric force felt by the proton
b) the proton’s acceleration;
c) the proton’s speed after in the field, assuming it starts from rest.