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Mr. Dubey • 100.64K Points
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Q. The formula, NI = 45000/(L/D), gives proper magnetising current for a coil, regardless of coil size as long as:

  • (A) The test piece is not larger than 1/10 the cross sectional area of the coil
  • (B) AC current only is used
  • (C) The test piece essentially fills the coil
  • (D) The test piece is held tightly against the coil
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