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JEE Advanced · Physics · 20. Magnetism & Current

A small circular loop of area A and resistance R is fixed on a horizontal xy-plane with the center of the loop always on the axis n^ of a long solenoid. The solenoid has m turns per unit length and carries current I counter clockwise as shown in the figure. The magnetic field due to the solenoid is in n^ direction. List-I gives time dependences of n^ in terms of a constant angular frequency ω. List-II gives the torques experienced by the circular loop at time t=π6ω, Let α=A2μ02m2I2ω2R.
  List-I   List-II
(i) 12sinωtj^+cosωtk^ (p) 0
(ii) 12sinωti^+cosωtj^ (q) -α4i^
(iii) 12sinωti^+cosωtk^ (r) 3α4i^
(iv) 12cosωtj^+sinωtk^ (s) α4j^
    (t) -3α4i^
Which one of the following options is correct?

  1. A iq,iip,iiis,ivt
  2. B is,iit,iiiq,ivp
  3. C iq,iip,iiis,ivr
  4. D it,iiq,iiip,ivr
Verified Solution

Answer & Solution

Correct Answer

(C) iq,iip,iiis,ivr

Step-by-step Solution

Detailed explanation

Note: This question was given bonus by JEE council. The magnetic field in a solenoid is given by, B=μ0mIn^. Therefore, the flux through the loop will be,
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