Solve the all parts of following question given below:
Question: Two oppositely charged identical insulating spheres, each 42.0cm in diameter and carrying a uniform charge of magnitude 190µC, are placed 1.00m apart center to center.
Part A: If a voltmeter is connected between the nearest points (a and b), what will it read?
Part B: Which point, a or b, is at the higher potential?
Part C: How can you know this without any calculations?
If possible just a brief explanation how you got the answer for above questions?