Which labels belong in the areas marked X and Y? X: absorbs heat
Y: involves a change between solids and liquids
O X: absorbs heat
Y: involves a change between gases and solids
O X: involves a change between solids and liquids
Y: releases heat
O X: involves a change between gases and liquids
Y: releases heat

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.)