In the Millikan experiment, oil droplets were found to have the following charges `:1.56 xx 10^-19C, 4.88xx 10^-19C, 1.64 xx 10^-19C and 4.76 xx 10^-19C`. Use these data to determine a value for the elementary charge. Explain your working.

The procedure in was repeated for three further oil droplets. The magnitude of the charge on each of the droplets was found to be 3.2 xx 10^-19C, 6.4 xx 10^-19C and 3.2 xx 10^-19C . Explain what value these data and your answer in would guggest for the charge on the electron.

Can be body have charge of 4 xx 10^(-19) C

Find out the vlaue of 1 Bohr magneton. Givne h = 6.62 xx 10^-34 J s, e = 1.6 xx 10^-19C and m _e = 9.1 xx 10^-31 kg

Two points charges q_1 = 10 xx 10^-8 c and q_2 = -2 xx 10^-8 C are separated by a distance of 60cm in air. Also calulate the electrostatic potential energy of the system.

Two point charges of +5xx10^-19C and +20 xx 10^-19 C are separated by a distance 2m. Find the point on the line joining them at which electric field intensity is zero.