Chapter 3, Problem 3.45P

To determine

(a)

The derivation of $\frac{1}{t_d}+\frac{1}{t_u}=\left(\frac{E}{6\pi r\eta l}\right)q$ and derive it equal to $Kq$ .

To determine

(b)

The value $\frac{l}{t_d}+\frac{l}{t_u}$and show that the quantity is an integer multiple of the fixed number.

To determine

(c)

The radius $r$ of the droplet.

To determine

(d)

The four different charges $q$ on the droplet and the estimate of the $e$ based on this experiment.