What will be the magnitude of the induced EMF (in V) in a coil of area of 200 square centimetres with 200 turns, if the coil is removed from a magnetic field of 20 T action at right angles to the coil 1 second.

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SSC JE EE Previous Year Paper 13 (Held On: 29 Jan 2018 Morning)
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  1. 60
  2. 80
  3. 20
  4. 30

Answer (Detailed Solution Below)

Option 2 : 80
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Detailed Solution

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Given that, Area (A) = 200 square centimetres

Number of turns (N) = 200

Change in magnetic field (ΔB) = 20 T

Change in time (Δt) = 1 second

\(\left| e \right| = N\left( {\frac{{{\rm{\Delta }}B}}{{{\rm{\Delta }}t}}} \right).A\cos \theta = 200 \times \left( {\frac{{20}}{1}} \right) \times 200 \times {10^{ - 4}} \times \cos 0 = 80\;V\)
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