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Assertion: flux emerging from iron into air runs nearly normal to the surface. Reason: the tangential field intensity is continuous across the boundary.

  • A.both the assertion and the reason are true and the reason explains the assertion
  • B.both the assertion and the reason are true but the reason does not explain the assertion
  • C.the assertion is true but the reason given for it is false
  • D.the assertion is false although the reason offered is a true statement in itself

Answer: A

Continuity of the tangential intensity means the tangential flux density falls by the permeability ratio on leaving the iron, while the normal flux density is unchanged, so the emerging flux is dominated by its normal component. The reason is exactly what produces the effect.

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