Compute all parts of following question given below:
Question: Assume the corners of a cube of side a are occupied each by a positive charge q,
Part A: What is the net force on each of the eight charges?
Part B: How much electrical energy was needed to bring all the charges to this configuration?
Part C: If one of the charges was free to move, it will accelerate away from the rest of charges. What will be it's final speed when it is very far away?
Please help for the above question, completely confused!! Show each steps if possible, Thanks.