A good problem for physics students practicing Coulomb's Law. The problem is the following: The electric force between two charges Q1 and Q2 is F when they are separated a distance d. If the Q1 charge is made six times stronger, the Q2 charge is cut in half, and their separation increases to 4 d, what should be the new force between the charges Q1 and Q2?The link to many other science activities in TpT, including 85 that are free to download is the following: https://science.ceressoft.net/tpt