CUET · PHYSICS · PYQ PAPER 2025
The expression of the magnetic energy stored in a solenoid in terms of magnetic field B, cross-sectional area A and length l of the solenoid, is:
- A \( U_B = \frac{1}{2\mu_0} B^2 Al \)
- B \( U_B = \frac{1}{\mu_0} B^2 Al \)
- C \( U_B = \frac{1}{2\mu_0} B^2 \frac{A}{l} \)
- D \( U_B =mu_0 B^2 Al \)
Answer & Solution
Correct Answer
(A) \( U_B = \frac{1}{2\mu_0} B^2 Al \)
Step-by-step Solution
Detailed explanation
\( u_B = \frac{B^2}{2\mu_0} \) \( U_B = u_B \cdot V \) \( U_B = \frac{B^2}{2\mu_0} Al \)
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