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)`

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

If mass of one atom is 3.3xx10^(-23) g, the number of nucleons (neutrons and protons) present in 2 atoms of the element

Calculate the number of moles of hydrogen present in 10 dm^(3) of the gas at 25^(@)C and 1.5 atm pressure.

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.

Vitamin C is known to contain 1.29xx10^24 hydrogen atoms. Calculate the number of moles of hydrogen atoms.

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.

A current 10 A is maintained in a conductor of cross section 10^(-4)m^(2) . If the number density of free electrons be 9 xx 10^(28) m^(-3) . Calculate the drift velocity of free electrons. ( e = 1.6 x 10^(-19)C)

A polythene piece rubbed with wool found to have a negative charge of 3xx10^(-7)C .Estimate the number of electrons transferred (from which to which?)