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Question

Explain the sign of emf using Lenz's law.


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Solution

  1. Len'z law states that,emf=-Ndϕdt
  2. Here emf is the induced voltage, N is the number of loops, and ϕis the magnetic flux
  3. The negative sign implies that the emf induced in the coil is in opposite direction to the flux that is linked to the coil
  4. The direction of emf is always such that it opposes the change

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