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Electromagnetic Induction question

2019 · Q151
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Electromagnetic Induction question

2019 · Q151

NEETPhysicsElectromagnetic InductionMCQ+4 / −1
A 800 turn coil of effective area 0.05 m2 is kept. perpendicular to a magnetic filed 5 × 10–5 T. When the plane of the coil is rotated by 90o around any of its coplanar axis in 0.1 s, the emf induced in the coil will be :
  1. A
    0.2 V
  2. B
    0.02 V
  3. C
    2 V
  4. D
    2 ×\times× 10-3 V
View written solutionFree

Correct answer: B

Given N = 800, A = 0.05 m2 , B = 5 × 10–5 T

Δ\Delta Δt = 0.15 s

We know, e = −(ϕf−ϕi)Δt - {{\left( {{\phi _f} - {\phi _i}} \right)} \over {\Delta t}}−Δt(ϕf​−ϕi​)​

= −(0−NBA)Δt - {{\left( {0 - NBA} \right)} \over {\Delta t}}−Δt(0−NBA)​

= 800×5×10−5×5×10−20.1{{800 \times 5 \times {{10}^{ - 5}} \times 5 \times {{10}^{ - 2}}} \over {0.1}}0.1800×5×10−5×5×10−2​

= 0.02 V

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