Solve the all parts of following question:
Question: A cylindrical copper cable 1.90km long is connected across a 220.0V -potential difference.
Part A: What should be its diameter so that it produces heat at a rate of 70.0W?
D= .......mm?
Part B: What is the electric field inside the cable under these conditions?
E=....................V/m
Please show your results in detailed calculations for above question.