Hriday Saini
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Poll

A conducting wire of length l is turned In the form of a circular coil and a current l is passed through it. For the torque, due to magnetic field produced at its centre, to be maximum, the number of turns in the coil will be

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Poll Results

0%(C) Three
100%(B) Two ( 1 voter )
0%(D) More than Three.
Based On 1 Vote

Participate in Poll, Choose Your Answer.

To maximize torque, the magnetic moment (m = nIA) should be maximized. For a
given length l, the area A is maximum when the number of turns n = 1, forming the
largest possible radius. Hence, the correct answer is (A) ONE.

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1 Answer

  1. The torque (τ) on a current-carrying coil is given by:
    τ = nI AB

    For fixed wire length l, the radius is:
    r = l/2πn
    Torque is maximized when n = 2, as the product of the number of turns and area is optimized.

    Answer: (B) Two

    For more visit here:
    https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-4/

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