Question Bank NAT • 2 Marks Section 3: Electromagnetic Theory Electrostatics and Magnetostatics

QB_PH_086: Electrostatics and Magnetostatics

Question Statement

A solenoid ($l = 0.5\text{ m}, r = 0.02\text{ m}, N = 1000\text{ turns}$) carries $I = 2\text{ A}$. The stored magnetic energy in mJ is (rounded to one decimal place):
Correct Answer
6.2, 6.4
Verified Key

Step-by-Step KaTeX Derivation & Detailed Explanation

### Solution: $L = \frac{\mu_0 N^2 A}{l} = 3.158\text{ mH} \implies U = \frac{1}{2} L I^2 \approx 6.31\text{ mJ}$.
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