How much is the charge on an electron ?

There Is one copper sphere and a copper shell with radii 5 cm and separated by a distance of 30 cm from the centre. They are charged to a potential of 10 V on their surfaces. The solid sphere attained a charge of Q. How much is the charge gained by the shell?

The absolute value of charge on the electron was determined by:

The absolute value of charge on the electron was determined by:

A 230 V, 115 W filament lamp works in a circuit for 10 minute . How much is the quantity of charge that flows through the bulb in 10 minute ?

How much is each angle of a 15 side regular polygon? How much is each outer angle?