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NEET 2011 (AIPMT, Prelims) · Nature of EM Waves & Wave Equation

Nature of EM Waves & Wave Equation question from NEET 2011 (AIPMT, Prelims)

Q85NEET 2011 · AIPMT · PRELIMSEasy

Nature of EM Waves & Wave Equation

The electric and the magnetic field, associated with an e.m. wave, propagating along the +z-axis, can be represented by

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Answer: (a)

  1. Propagation direction is E⃗×B⃗\vec{E}\times\vec{B}; it must be +k^+\hat{k}.
  2. (a): i^×j^=k^\hat{i}\times\hat{j} = \hat{k}. Correct.
  3. (b) k^×i^=j^\hat{k}\times\hat{i} = \hat{j}, (c) j^×i^=−k^\hat{j}\times\hat{i} = -\hat{k}, (d) j^×k^=i^\hat{j}\times\hat{k} = \hat{i}. Rejected.
  4. So the answer is (a).
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