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

QB_PH_078: Electrostatics and Magnetostatics

Question Statement

A toroid with $N = 500\text{ turns}$, mean radius $r = 10\text{ cm}$, carries current $I = 2\text{ A}$. The core magnetic field in mT is:
Correct Answer
2, 2
Verified Key

Step-by-Step KaTeX Derivation & Detailed Explanation

### Solution: $B = \frac{\mu_0 N I}{2\pi r} = \frac{4\pi \times 10^{-7} \times 500 \times 2}{2\pi \times 0.1} = 2.0\text{ mT}$.
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