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  1. In an AC generator, a coil with N turns, all of the same area A and total resistance R,
  2. In L-C-R series circuit, an alternating emf e and current i are given by the equations
  3. The threshold frequency for a certain photosensitive metal is ν₀. When it is illuminated
  4. The current through an inductor changes from 3 A to 2 A is 1 m/s. If induced e.m.f.
  5. The vector sum of two forces is perpendicular to their vector difference. In that case,