Phys201 Review Problems – Ch30 Page 7 14. Two long straight wires carry currents perpendicular to the xy plane. One carries a current of 50 A and passes through the point x = 5.0 cm on the x axis. The second wire has a current of 80 A and passes through the point y = 4.0 cm on the y axis. What is the magnitude of the resulting magnetic field at the origin? Ans: 450μT 16. A current path shaped as shown in Figure P30.13 produces a magnetic field at P, the center of the arc. If the arc subtends an angle of θ 5=30.0 o and the radius of the arc is0.600 m, what are the magnitude and direction of the field produced at P if the current is 3.00 A? Ans: 262nT
Phys201 Review Problems – Ch30 Page 8 17 . A long, straight wire carries a current I. A right-angle bend is made in the middle of the wire. The bend forms an arc of a circle of radius r as shown in Figure P30.1 Determine the magnetic field at point P, the center of the arc. Ans: 0.28415 μo I/r 18. The drawing shows four insulated wires overlapping one another, forming a square with 0.050-m sides. All four wires are much longer (long wires) than the sides of the square. The net magnetic field at the center of the square is 61 μT. Calculate the current I .
Phys201 Review Problems – Ch30 Page 9 19. Two long, straight wires are separated by 0.120 m. The wires carry currents of 8.0 A in opposite directions, as the drawing indicates. Find the magnitude of the net magnetic field at the points labeled (a) A and (b) B . 20. The drawing shows two perpendicular, long, straight wires, both of which lie in the plane of the paper. The current in each of the wires is I = 5.6 A. Find the magnitudes of the net magnetic fields at points A and B.
Phys201 Review Problems – Ch30 Page 10 21. The triangular loop of wire shown in the drawing carries a current of I = 4.70 A.
- Spring '12
- Current, Magnetic Field, Sources of Magnetic Fields, A. Hamad