PLEASE ANSWER ALL QUESTIONS. Thanks!

4. How much work is needed to move a proton from a point with a potential of +100 V to a point where it is -50 V? Express your answer both in joules and electron volts. 5. What minimum work is required by an external force to bring a charge q=3.00 uC from a great distance away (take race) to a point 0.500 m from a charge Q= 20.0 JC. Electric Potential: Potential Energy 6. How much potential energy does a proton lose as it falls through a potential drop of 5 7. Find the electric potential energy of three point charges placed as follows on the x-axis: +2.0 pC at x= 0, +3.0 pC at x= 20cm, and +6.0 JC at x= 50cm. Take the PEr to be zero when the charges are far separated