Number of electrons in one coulomb of charge will be

$A$ conductor has $14.4 \times 10^{-19} \ C$ of positive charge. The conductor has (Charge on an electron $= 1.6 \times 10^{-19} \ C$):

Assertion $(A)$: Half of the charge of an electron does not exist. Reason $(R)$: Electric charge is quantized.

Four metal conductors having different shapes:
$1.$ $A$ sphere
$2.$ Cylindrical
$3.$ Pear
$4.$ Lightning conductor
are mounted on insulating stands and charged. The one which is best suited to retain the charges for a longer time is:

Which instrument is used to detect the charge on a body? Explain it with a diagram.

Give reason: 'Small and light pieces of paper are attracted by a comb run through dry hair.'