Find the potential difference between a point on the axis and a point on the outer cylinder. Note that it is not necessary to commit yourself to a particular reference point.

Explanation:

Solution:

- The Electric potential V is given as line integral(L) of Electric Field E. The expression.

Where, r is the radial distance from the axis of charged body.

- The coaxial cable has inner radius (a) and outer radius (b). The potential difference between the inner radius (a) and outer radius (b) can be expressed as follows:

learn it on the intertant so you can solve

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be