Consider a solid conducting sphere with radius a and charge Q1 and a concentric conducting spherical shell with inner radius b > a , outer radius c and a net charge Q 2 .

Denote the charge on the inner surface of the shell by Q'2 and on the outer surface by Q??2
1. find the charge Q''2
2. Find the magnitude of the electric field at point P (||EP|| ? EP) , where the distance from
P to the center is (a+b)/2
3.Find the potential VP at point P. Assume the potential at r=?is zero

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.