A high-voltage power line carries a current of 2 200 A. It hangs 23.0 m above the ground. What magnetic field does this current create at a point on the ground, directly beneath the power line? ( µ 0 = 4 π × 10 −7 T ⋅m/A)
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- 2. Each of the diagrams (a), and (b) represents a positively charged particle moving at velocity v through a magnetic field B whose field lines are shown. In each case, tell the direction of the force experienced by the moving particle in the field. X X X X X X X X X X X X Bin X X X X X X (а) (b)16. (25) a.) Two electric charges, qq and q2 lie on the x-axis at positions of + 10 cm and - 10cm, respectively. What is the force on a third charge q3 that is placed at x = 0, if q1 = 10 µC, q2 = -10 µC and q3 = 20 µC? b.) An electron enters a uniform magnetic field whose magnitude is 1.5 T and direction is parallel to the + z-axis. If the electron's velocity is 2.0 î – 3.0 ĵ+1.0 k m/s what is the force on the electron? c.) The magnet in the diagram is moved to the left. Copy the diagram into your blue book and indicate the direction of the induced electric current, which you should find using Lenz's Law. What is the situation some time later, when the magnet has stopped moving? Explain your answers. Lume R21. Two particles Y and Z with equal mass and speed enter a uniform magnetic field and follow the paths as shown. How do their magnitude and polarity of charge compare? A. B. C. D. Y MAGNITUDE OF CHARGE YZ Y>Z X X X X X X X X X X X X X X X X X X N х в X X X POLARITY same charge opposite charge same charge opposite charge
- 15. A 52uC charge particle moves parallel to a long wire with a speed of 720 m/s. The separation between the particle and the wire is 13 cm, and the magnitude of the force exerted on the particle is 1.4 x 10-7. Find the magnitude of the magnetic field at that point, and the current in the wire.2. A proton of mass m = 1.67 x 10 27 kg moves through a uniform magnetic field with the expression B = 10î – 203 + 30k mT. During some time, the proton has a velocity as ī = v,î + v„j+2000 m/sk with the magnetic force of FB = (4 × 10 17 N)î + (2 × 1017 N)j. Determine the components v, and vy.9. A electron with charge -1.60 × 10-19 C and mass 9.11 × 10-31 kg is accelerated from rest through 14.20 kV. It then enters a uniform magnetic field of 7.50 x 10-4 T that is oriented perpendicular to its direction of motion. (a) What is the radius of the path the electron follows in the magnetic field? (b) How long does it take the electron to make one complete circle in the magnetic field?
- 23)10. Two wires carrying 3 A out of the page each are centered about the origin and separated by 8 cm along the x axis. a) Find the magnitude and direction of the magnetic field at a point +4 cm on the y axis. b) Find the magnitude and direction of the field at the origin. c) What is the magnitude of the force between the two wires? Attractive or Repulsive?