physics·NCERT Class 12·Moving Charges & Magnetism
Magnetic Field & Right-Hand Rule
Medium+70 XP
A current-carrying wire creates a magnetic field in circles around it — but which way do the circles go? Curl your right hand around the wire to find out.
›B around a straight wire: B = μ₀I/2πr (circle around wire).
›Solenoid field: B = μ₀nI — uniform inside, nearly zero outside.