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Mr. Dubey • 100.64K Points
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Q. How many turns of a coil will be needed to establish a longitudinal field in a steel shaft that is 22.86 cm (9 inches) long and 7.62 cm (3 inches) in diameter? 3000 amperes magnetizing current is available, it is desired to magnetize the part in accordance with the formula NI = 45,000/(L/D):

  • (A) 1
  • (B) 3
  • (C) 5
  • (D) 7
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