CUET · PHYSICS · PYQ PAPER 2025
When a current carrying coil is placed in a uniform external magnetic field with its magnetic moment antiparallel to the external magnetic field, then
(A) its potential energy is minimum
(B) its potential energy is maximum
(C) torque on it is maximum
(D) torque on it is zero
(E) coil is in unstable equilibrium
Choose the correct answer from the options given below:
- A (A), (C) and (E) only
- B (B), (D) and (E) only
- C (B), (C) and (E) only
- D (A), (D) and (E) only
Answer & Solution
Correct Answer
(B) (B), (D) and (E) only
Step-by-step Solution
Detailed explanation
For magnetic moment antiparallel to magnetic field, \(\theta = 180^\circ\). \(U = -\mu B \cos\theta = -\mu B \cos(180^\circ) = \mu B\) (potential energy is maximum) \(\rightarrow\) (B) \(\tau = \mu B \sin\theta = \mu B \sin(180^\circ) = 0\) (torque on it is zero) \(\rightarrow\)…
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