Solve the all parts of given question:
Question: A parallel-plate capacitor has plates with an area of 850 cm2 separated by 1.8 mm.
Part A: What is the electric field between the plates when they are charged with 5.000 x 10-7 C?
Part B: Calculate the maximum potential difference that can be maintained across a 40-mm layer of polyethylene?
Please give me an explanation for above question.