There are 4 identical metallic spheres: J, K, L, M. Initially, J has charge QJi = 0e, L has charge QLi = +8e, and M has charge QMi = +34e. Sphere J touches sphere K and then separates them. Afterwards, sphere J touches sphere L and then they are separated. So sphere J touches sphere M and then they are separated. The final charge on sphere J is QJf = -19e. What was the initial charge on sphere K? QKi = ? (You must put a + or - sign on your answer, unless it is zero; for example +5e if positive, -10e if negative, 0e if zero.)