Answer:
The final charge on each square plate is +10
Step-by-step explanation:
The law of conservation of charge states that the charge in a system, isolated from the environment, can only be transferred to another system, as the charges can neither be destroyed nor created
Therefore, the sum of the charges in a system is always constant such that the net charge in the universe is constant
Therefore, given the amount of charges in the 1 cm side = -5
The amount of charge in the 2 cm side = +15
The net charge when they touch = The charge on the 1 cm + The charge on the 2 cm
The net charge when they touch = -5 + 15 = +10
The final charge on each square plate = +10.