By exploiting the above symmetry, or otherwise, calculate the electric potential V at a point on the axis of the annulus a distance d from its center. Be sure to visualize this carefully; the point we are interested in lies along the axis of the annulus, but is above the plane of the annulus by a distance d. Express your answer in terms of some or all of the variables σ, r1, r2, and d. Use k(=14πϵ0).

gets less

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

continuous conducting path for current, power supply

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.