A planar loop of wire rotates in a uniform magnetic field. Initially, at t = 0 , the plane of the loop is perpendicular to the magnetic field. If it rotates with a period of 10 s  about an axis in its plane then the magnitude of induced emf will be maximum and minimum, respectively at:

Option 1 -

2.5 s and 5.0 s

Option 2 -

5.0 s and 10.0 s

Option 3 -

2.5 s and 7.5 s

Option 4 -

5.0 and 7.5 s

0 2 Views | Posted 2 months ago
Asked by Shiksha User

  • 1 Answer

  • A

    Answered by

    alok kumar singh | Contributor-Level 10

    2 months ago
    Correct Option - 1


    Detailed Solution:

    At any time  t

    ? = B A c o s ? π t 5 ? ω = 2 π T = 2 π 10 = π 5

    d ? d t = - π 5 B A s i n ? π t 5

    e = π 5 B A s i n ? π t 5

    e will be maximum when π t 5  is π 2 .

    t = 2.5 s e c
    e will be minimum when π t 5 is π , 0

    t = 0,5 s e c

    So, answer will be (1).

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