Solve the all parts of given question:
Question: In a wire of radius R = 3.40 mm the magnitude of the current density is J = Ar/R, where r is the radial distance out from the central axis. The factor A increases with time by the function A = 5.50 x 104 (t).
Part A: What is the total current in the wire at t = 1.00 s?
Part B: How many electrons flow past a cross section of the wire from t = 0 to t = 1.00 s?
I want help to find how many electrons flow past a cross section of the wire.