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Electromagnetic Induction question

2011 · Q129
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Electromagnetic Induction question

2011 · Q129

NEETPhysicsElectromagnetic InductionMCQ+4 / −1
The current iii in a coil varies with time as shown in the figure. The variation of induced emf with time would be

AIPMT 2011 Prelims Physics - Electromagnetic Induction Question 19 English
  1. A
    AIPMT 2011 Prelims Physics - Electromagnetic Induction Question 19 English Option 1
  2. B
    AIPMT 2011 Prelims Physics - Electromagnetic Induction Question 19 English Option 2
  3. C
    AIPMT 2011 Prelims Physics - Electromagnetic Induction Question 19 English Option 3
  4. D
    AIPMT 2011 Prelims Physics - Electromagnetic Induction Question 19 English Option 4
View written solutionFree

Correct answer: A

e = -Ldidt{{di} \over {dt}}dtdi​

During 0 to T4{T \over 4}4T​, didt{{di} \over {dt}}dtdi​ = constant

∴\therefore∴ e = -ve

During T4{T \over 4}4T​ to T2{T \over 2}2T​, didt{{di} \over {dt}}dtdi​ = 0

∴\therefore∴ e = 0

During T2{T \over 2}2T​ to 3T4{3T \over 4}43T​, didt{{di} \over {dt}}dtdi​ = 0

∴\therefore∴ e = +ve

Thus graph given in option (a) represents the variation of induced emf with time.

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