Answer:
Part a)
Part b)
Explanation:
As we know that electric force on electric charge is given as
here we have
E = 153 N/C
now force is given as
Gravitational force on electric charge near surface of earth is given as
now the ratio of two forces is given as
Now the ball is balanced by the electric force and the force of gravity on it
so here we have
Answer:100 meters per min
no.