Two identical electrons are placed in the infinite square well potential 0, 0 x a too, otherwise. consider the following perturbation h as s2, where a is a small positive real constant. also si, s correspond to the spin operators of two electrons. calculate the first order correction to the energy of the ground state of this system

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.

gas and liquid