physics cheat sheet 4

physics cheat sheet 4 - 9. (II) (a) In a thick, straight...

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Unformatted text preview: 9. (II) (a) In a thick, straight wire carrying a current that is uniform through its cross section, where is the magnetic field the greatest? (b) If the radius of the wire is R and the current is I , what is the value of the maximum magnetic field? (c) What is the minimum magnetic field, and where does this occur? Consider regions both inside and outside the wire. (d) Plot the magnetic field as a function of the distance from the center of the wire. 21. (II) A long, current-carrying wire is oriented vertically; next to it is drawn a square whose area lies in the same plane as the wire (Fig. 2934). Using the distances indicated, find the magnetic flux through the square. 29. (I) The magnetic field inside a cylindrical solenoid of area 4^2 cm is 0.15 T along the axis of the solenoid. What is the magnetic flux through a disk of radius 3 cm placed perpendicular to the solenoid axis (Fig. 2937)? 42. (II) Consider a thin dielectric ring 7 cm in diameter that rotates around a stem perpendicular to the plane of the ring and through its center at the rate of 120 rev s. Assume that the ring is charged uniformly and carries a total charge of 8 10 7 (II) Consider a thin dielectric ring 7 cm in diameter that rotates around a stem perpendicular to the plane of the ring and through its center at the rate of 120 rev s....
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