21_InstSolManual_PDF_Part7 - Electromagnetic Induction 21-7...

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21.21. Set Up: The bar and magnetic field are shown in Figure 21.21. To determine which end is at higher potential consider the direction of the magnetic force on a positive charge in the moving rod. Accumulation of positive charge produces higher potential. Figure 21.21 Solve: (a) (b) The magnetic force on a positive charge in the bar is eastward. Positive charge accumulates at end a of the bar and that end (the east end) is at higher potential. (c) If the bar is moving east to west the force is to the north. The force is perpendicular to the bar and there is no charge accumulation at its ends; the potential difference between its ends is zero. Reflect: If the bar moves parallel to the magnetic field there is no magnetic force and no potential difference is produced. 21.22. Set Up: The rod moves perpendicular to the magnetic field, so Eq. (21.6) applies. To determine which end is at higher potential, consider the direction of the magnetic force on a positive charge in the moving rod. The end where positive charge accumulates is the higher potential end.
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  • Spring '07
  • Shoberg
  • Charge, Force, Magnetic Field, 1 g, Positive charge, 0.4470 m, 1 4.50 m

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