A long, cylindrical conductor is solid throughout and has a radius 2.9cm. Electr

Question

A long, cylindrical conductor is solid throughout and has a radius 2.9cm. Electric charges flow parallel to the axis of the cylinder and pass uniformly through the entire cross section. The arrangement is, in effect, a solid tube of current 2.0A. Use Ampères law to find the magnetic field inside the conductor at a distance 2.2cm from the axis. (Hint: For a closed path, use a circle of radius r perpendicular to and centered on the axis. Note that the current through any surface is the area of the surface times the current density.)

Explanation / Answer

apply magnetic field B =   uoir/(2piR^2)

B = 4pie-7 * 2* 0.022/(2pi* 0.029*0.029)

B = 1.04 *10^-5 T

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