A certain particle carries '2.5 xx 10^(-16) C' of static electric charge. Calculate the number of electrons present in it.

In Millikans experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is '-1.282 xx 10^(-18) C'. Calculate the number of electrons present on it.

Calculate the total number of electrons present in one mole of methane

Calculate the total number of electrons present in '1.4 g' of nitrogen gas.

The charges on a body is found to be -3.2xx10^(-19)C .Calculate the number of excess electrons present in the body that of proton .(Take e=-1.6xx10^(-19)C)

Oxygen is present in a 1-litre flask at a pressure of 7.6 xx 10^(-10) mmHg at 0°C. Calculate the number of oxygen molecules in the flask.

True or false? . a) All particles in the atom have charge. b) Electron and proton haveopposite charges. So atom has no charge. c) Mass number is the total number of electron, proton and neutron. d) The number of neutrons are obtained on substracting atomic number from mass number.

An electron is moving northward with a velocity 8.5 xx 10^(6) ms^(-1) in a magnetic field 2T, directed downward. Calculate the instantaneous force on the electron.