`. ^10C_8+^10C_1=?`

Prove that , .^15C_8+.^15C_9-.^15C_6-.^15C_7=0

Three charges 2.0 * 10^-6 C, 3.0 *10^-6 C and 4.0 * 10^-6 C are placed at the three corners A, B. C of an equilateral triangle of side 20 cm. Find the force on the charge at C due to the rest two.

Prove that ""^8C_5+""^8C_4=""^9C_5

Prove that ""^7C_2+""^7C_3=""^8C_3 .

A photo electric surface has work function 2eV. What is the maximum kinetic energy of the emitted photoelectrons ejected by light by wavelength 3000overset(@)A Given h=6.6xx10^(-34)J-S,e=1.6xx10^(-19)C . m_e=9g0^(-31)kg,C = 3xx10^8m//sec

Find r if ""^8C_r-""^7C_3=""^7C_2 .

Can a body have a charge of 1.8xx10^(-19) C? Give reason.

ABCD is a square of side 20 cm positive charges of +2 * 10^-9 C. +4 * 10^-9 C and + 8 * 10^-9 C are placed at the corners A, B and C respectively. Calculate the work required to be done to transfer a unit positive charge from D to the point of intersection of the diagonals.