3a) Explain the motion of (a) a static electron, and (b) an electron in motion, under the influence of an applied magnetic field.
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- 1. An electron enters the region where there is a uniform magnetic field with a speed v = 9.39 x10 ^ 6 m / s, it describes a semicircular path of radius r = 0.12m, as in the figure. How long in seconds does it take in that region? (Express your answer in teslas to 3 significant figures)1) If two protons are traveling parallel to each other in the same direction and at the same speed, is the magnetic force between them (a) attractive or (b) repulsive? ANSWER: (EXPLAIN YOUR OPTION IN ONE SENTENCE ONLY)3) A long straight wire carries a current of 1.3 A. An electron is 2.3 cm from the wire and initially moving at speed 7.2 x 106 m/s in the opposite direction as the current in the wire. a) The electron is moving in the magnetic field from the wire. Calculate the magnitude of the magnetic force on the electron. b) Which of the following correctly describes the direction of the magnetic force on the electron? A) The magnetic force on the electron is directed toward the wire B) The magnetic force on the electron is directed away from the wire
- 1. An electron moves west at 6.9 x 105 m/s through a magnetic field directed [W75°N] with strength of 1.3 x 102 T. What magnitude and direction would the electron experience a magnetic force?3) One wire carries current I in positive direction along the x-axis and another wire carries current I in positive direction along the y-axis. a) Draw a figure showing the currents. b) Find direction and magnitude of magnetic field at the point (a,a,0) c) Find direction and magnitude of magnetic field at the point (a,-a,0) d) Find direction and magnitude of magnetic field at the point (-a,a,0) e) Find direction and magnitude of magnetic field at the point (-a,-a,0)6) A charged particle has velocity Jo = vfê + všŷ when it enters a region of uniform magnetic field B = Bââ, setting the particle on a helical motion. a) Determine the radius of the helix. b) Determine the time it takes to complete one full turn of the helix. c) Determine the displacement in the r-direction during the the time to complete one full turn of the helix.
- 3. A proton moving at speęd 4.00x10° m/s and angle e through a magnetic field of magnitude 1.70 T. The proton experiences a magnetic force of magnitude 8.20x1013 'N. What is the angle between the proton's velocity and the magnetic field? NOTE: qproton=1.6x10-19 C a) O 58.7° 38.9° b) O c)o 68.9 ° 35.3° d) O e) O 48.9 ° Leave blank35 - A proton moves in the +x-axis direction in the B magnetic field with the velocity V at an angle of 30 degrees with the magnetic field vector. What would be the magnitude of the magnetic force acting on the proton? A) F=eVB/3 B) F=3eVB/2 C) F=eVB/2 D) F=2eVB E) F=eVBComplete Solutions