Magnetic Field around a Current Loop?

📌 CONCEPT: The magnetic field around a current loop is a region around the loop where the magnetic force can be detected.

📐 RULE / FORMULA: The magnetic field strength (B) at the center of a circular loop is given by the formula B = μ₀ × (N × I) / r, where μ₀ is the magnetic constant, N is the number of turns, I is the current, and r is the radius of the loop.

💡 WORKED EXAMPLE: A circular coil of 100 turns and a radius of 25 cm carries a current of 3 A. Using the formula, we find B = (4π × 10^(-7)) × (100 × 3) / 0.25 = 1.2 × 10^(-3) T.

⚠️ COMMON MISTAKE: Students often forget to include the number of turns (N) in the formula, which can lead to incorrect answers.