Explore BrainMass

Explore BrainMass

    Electric current: Drift speed and the current density

    Not what you're looking for? Search our solutions OR ask your own Custom question.

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    1. A small but measurable current of 1.2X10^-10 A exists in a copper wire whose diameter is 2.5mm. The number of charge carriers per unit volume is 8.49X10^28 m^-3. Assuming the current is uniform, calculate the (a) current density and (b) electron drift speed.

    2. Near Earth, the density of protons is the solar wind (a stream of particles from the Sun) is 8.70 cm^-3, and their speed is 470km/s.(a) Find the current density of these protons.(b) If Earth's magnetic field did not deflect the protons, what total current would Earth receive?

    © BrainMass Inc. brainmass.com March 4, 2021, 8:12 pm ad1c9bdddf

    Solution Summary

    1. The current and the diameter for a copper wire is given the current density and the drift velocity of the electrons is calculated.
    2. The number of protons in solar wind is given, the current density and the current is calculated.