The resultant capacitance of four capacitors connected in series is the smallest individual capacitance
a)less than b)greater than c)equals to d) four times

a)less than

Explanation:

The resultant capacitance of N capacitors connected in series is given by

In this problem, since we have 4 capacitances in series, the resultant capacitance is

Each of the single term on the right-side of the equation is a positive term: this means that the term will be larger than the individual terms .

Therefore, this means that the reciprocal, C, will be smaller than each of the individual capacitances .

In particular, if the 4 capacitances are identical,

So the resultant capacitance will be:

So the correct answer is

a) less than

d) physical means can be used to separate the components of air.