Water is heated from the bottom not the top

if a pot of water were heated from the top it would boil slower as the heated water with stay at the top and not warm at the bottom. the water boils at the bottom because of convection currents. also because the rises from the bottom

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)

like poles repel so keep pushing north to north and repels funny to see this