Find the potential at the centre of a square of side `sqrt2` m which carries at its four corners cahrges `+2xx10^-9C+1xx10^-9C` `+3xx10^-9C` and `+4xx10^-9C`.

Find the potential at the centre of a square of side sqrt(2)m which carries at its four corners charges +2 xx 10^(-9)C, +1 xx 10^(-9)C, -2 xx 10^(-9)C and +3 xx 10^(-9)C .

A square of side 20 cm is enclosed within a sphere of radius 80 cm . Centres of the sphere and the square coincide at a common point . There are four charges of 2xx10 ^(-6 ) C. -5xx 10 ^(-6 ) , C .-3xx 10 ^(-6 ) C and 6xx10 ^(-6) C at the four corners of the square . the electric flux passing through the surface of the sphere in N .m ^(2) //C.

By how much would the stopping potential for given photosensitive surface go up if the frequency of the incident radiations were to be increased from 4xx10^(15) Hz to 8xx10^(15)Hz ? Given h = 6.4xx10^(-34) J.s, e = 1.6xx10^(-19)C and c = 3xx10^(8) m.s^(-1) .

Electric field intensities at two axial points of an electric dipole at distances 5 cm and 10 cm from its centre are 2.5 xx 10 ^( 4 ) N * C ^( - 1 ) and 2 xx 10 ^ 3 N * C ^ ( - 1 ) respectively. The dipole is placed in air. determine the length of the dipole.

Calculate the degree of hydrolysis of 0.10 M solution of KCN. Dissociation constant of HCN = 7.2 xx 10^(-10) at 25@C and K_w = 1.0 xx 10^(-14)

An electron is subjected to a potential difference of 180 V. Mass and charge of an electron are 9 xx 10^(-31)kg and 1.6 xx 10^(-19)C , respectively. Find the velocity acquired by the electron.

Calculate the voltage needed to balance on oil drop carrying 10 electron, when located between the plates of capacitor, which are 5 mm apart.Given, mass of drop = 3xx10^(-16)kg , charge on electron= 1.6xx10^(-19)C and g = 9.8 m/s^2 .