Calculate the earth's potential. Assume earth has a surface charge density of 1` "ectron/metre"^(2)`.(Given,the electronic charge = `-1.6xx10^(-19)C," earth's radius "=6.4 xx10^(6)m,e_(0) = 8.9xx10^(-12)c^(2)//Nm^(2)`)

Assume that earth has a charge of surface density 1 electron per metre^3 . Calculate the earth's electric field

Assume that earth has a charge of surface density 1 electron per metre^2 . Calculate the earth's electric potential just outside the earth's surface.

Calculate the electric potential energy of electron-proton system of hydrogen atom. The radius of the electron orbit r= 0.53xx10^-10m , Electron charge e= 1.6xx 10^-19C

Calculate the ratio of electric and gravita-tional forces between two electrons. (charge of the electron (e) = 1.6 xx 10^(-19) c , mass of the electron (m) = 9.1 xx 10^(-31) kg, (1)/(4pi epsilon_(0)) = 9 xx 10^(9) Nm^(2)C^(-2) , universal gravitational constant G = 6.67 xx 10^(-11) Nm^(2) kg^(-2) )

Find the escape velocity of a body from the earth. [M (earth ) = 6 xx 10^(24) kg, R ( earth) = 6.4 xx 10^(6) m. G = 6.67 xx 10^(-11) N.m^(2)//kg^(2)]

Find the gravitational potential energy of a body of mass 10 kg when it is on the earth's surface. [M(earth) =6xx10^(24)kg,"R (earth)"=6.4xx10^(6)m, G=6.67xx10^(-11)N.m^(2)//kg^(2)]