Calculate the magnitude and direction of the electric field. Which keeps a proton just floating. Give that mass of proton `1.67 xx 10^-27` kg, charge on proton `= 1.6 xx 10^-19` C and `g = 9.8 ms^-2`

One atomic mass unit is equal to 1.67 xx 10^-27 g .

Find de-Broglie wavelength associated with a proton of energy 2 MeV. Given, mass of proton is 1.67 xx 10^(-27) kg .

Calculate the voltage needed to balance an oil drop carrying 10 electrons, when located between plates of a capacitor, which are 5 mm apart. Given, mass of the drop = 3xx 10^-16 kg , charge on electrno = 1.6 xx 10^-19 C and g = 9.8 m s^-2

Calculate the magnitude of the electrostatic force exerted by the proton on the electron in the hydrogen atom and compare it with the weight of the electron. Given that mass of electron is 9.1 xx 10^-31 kg, charge on electron is 1.6 xx 10^-19 C and radius of hydrogen atom is 0.53 overset(@)A .

A proton is travelling with horizontal velocity v_x=2.5xx10^8cms^-1. Calculate the transverse deflection in travelling horizontal distance, x=5cm in electric field of E_y=400V//cm . Mass of proton, m=1.6xx10^(-24)g , charge on proton, e=1.6xx10^(-19)C.

Find the magnitude of electric field which will jut balance a deutron of mass 3.2 xx 10^-27 Take g = 10 ms^-2

Calculate the ratio of electrostatic to gravitational force between two electrons placed at a certain distance in air. Given that m_e = 9.1 xx 10^31 kg, e = 1.6 xx 10^19C and G = 6.6 xx 10^17 N m^2 kg^-2