workout 29 - HPHY 253 Workout 29 The Magnetic Force Dr. A....

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HPHY 253 Workout 29 The Magnetic Force Dr. A. E. Bak Name 1. Serway and Jewett Problem 29 : 1 as each enters a region of magnetic ±eld as shown in Figure P 29 : 1 . It follows from the relation f = q v B that a positive charge feels a magnetic force in the same direction as the vector v B , while a negative charge feels a force in the opposite direction. ± Scenario a : The direction of v B is straight up. Because the charge is positive, the magnetic force on it is also straight up. Consequently, the particle veers upward initially. ± Scenario b : The direction of v B is into the page. Because the charge is negative, the magnetic force on it is out of the page. Consequently, the particle veers out of the page initially. ± Scenario c : The vector v B vanishes. Therefore, f = 0 ± Scenario d : The direction of v B is into the page. Because the charge is positive, the magnetic force on it is also into the page. Consequently, the particle veers into the page initially. 2. In fair weather at the equator near Earth²s surface, the magnetic ±eld is approximately 50 : 0 north- ward and the electric ±eld is about 100 N= C downward. At some instant in time, an electron is moving through this environment with an eastward velocity of 6 : 00 10 6 m=s . Find the gravitational, electric, and magnetic forces on the electron at that instant. Take the + x direction as straight east, the
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workout 29 - HPHY 253 Workout 29 The Magnetic Force Dr. A....

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