1. Two charged particles 1 m apart exert a 2-N force on each other. If the magnitude of each charge is doubled, what will be the force on each particle? 2. A pair of charged particles repel each other with a force 4 N. If the charge of one particle is doubled and the distance between them is doubled, what will be the force on each particle? 3.If the electric power that costs 10 cents per kilowatt hour, what is the cost of operating a 110-V heater that uses 20 A for 10 hours?