JEE Advanced · Physics · 20. Magnetism & Current
A small circular loop of area and resistance is fixed on a horizontal -plane with the center of the loop always on the axis of a long solenoid. The solenoid has turns per unit length and carries current counter clockwise as shown in the figure. The magnetic field due to the solenoid is in direction. List-I gives time dependences of in terms of a constant angular frequency . List-II gives the torques experienced by the circular loop at time , Let .
| List-I | List-II | ||
| (i) | (p) | ||
| (ii) | (q) | ||
| (iii) | (r) | ||
| (iv) | (s) | ||
| (t) |
- A
- B
- C
- D
Answer & Solution
Correct Answer
(C)
Step-by-step Solution
Detailed explanation
Note: This question was given bonus by JEE council. The magnetic field in a solenoid is given by, . Therefore, the flux through the loop will be,
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