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1-How many electrons flow through a point in a wire in3.00 s if there is a...

1-How many electrons flow through a point in a wire in3.00 s if there is a constant current of I = 4.00 A ?

2-The current of an electron beam has a measured current of I = 50.00 μA with a radius of 1.00 mm2 . What is the magnitude of the current density of the beam?

3-Consider a wire of a circular cross-section with a radius of R = 3.00 mm . The magnitude of the current density is modeled as J = cr2 = 5.00 × 106 (A/m4)r2 . What is the current through the inner section of the wire from the center to r = 0.5R ?

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