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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.

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