A long straight wire diameter 20 mm carries a current of 40 A What is the

# A long straight wire diameter 20 mm carries a current

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10. A long straight wire (diameter = 2.0 mm) carries a current of 40 A. What is the magnitude of themagnetic field 1.5 mm from the axis of the wire? Ans: 5.3 mTPHY201 -Review Problems 2017Page 4
13. 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 PHY201 -Review Problems 2017 Page 5
15 . 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 PHY201 -Review Problems 2017 Page 6
16. 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 . 17. 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 .

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