PHYSICS II – Problems
21. For the two very long straight current-carrying conductors shown below, determine the resultant magnetic field at points A, B, and C. [
A 1x10-4 T out; B 8.3 x 10-6 T out; C 1.625 x 10-4 T in]
22. Each of two long straight parallel wires separated by a distance of 16 cm carries a current of 20 A in the same direction. What is the magnitude of the resulting magnetic field at a point that is 10 cm outside one wire? 55
mT23. Three long wires parallel to the x axis carry currents as shown. If I = 20 A, what is the magnitude of the magnetic field at the origin? 4.67
mT
24. For the two very long straight current-carrying conductors (seen from head on) shown below, determine the resultant magnetic field (magnitude & direction) at point P. [
4.77 x10-5 T @ 359o]
25. The figure shows a cross section of three parallel wires each carrying a current of 24 A. The currents in wires B and C are out of the paper, while that in wire A is into the paper. If the distance R = 5.0 mm, what is the Magnetic Field (magnitude & direction) at a point equidistance between A & B. (2.4 x 10-3 T, up)
26. A coil of wire with 1000 turns, carrying a current of 15 amperes, has a radius of 12 cm.
a) What is the magnetic field at point A, at the center of the loop (magnitude and direction)?
7.85 x 10-2 Tb) What is the magnetic field on the axis of the loop at point B, a distance of 40 cm from the loop?
1.86 x 10-3 T
27. A solenoid is shown below. It has a length of 40 cm, a current of 18 amperes, a radius of 2 cm, and 80 turns of wire over its length. a) What is the magnetic field inside the solenoid?
4.52 x 10-3 Tb) If the wire is wound about a iron core, what would be the magnetic field in the iron?
24.9 T
28. A toroid is shown below. The radial distance to the center of the toroid is 4 cm. There is a current of 24 amperes flowing in the direction indicated. There are 60 turns of wire about the toroid. What is the magnetic field inside the toroid at radius R from the center?
7.2 x 10-3 T
