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Assertion: energy reaches a resistor through the space around its leads. Reason: the Poynting vector within the conductors points inward.

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

Answer: B

The inward vector at the conductor surface is precisely the statement that energy crosses into the metal from outside, and its surface integral is the ohmic loss. The two statements are two descriptions of the same field configuration.

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