Magnetic Field Finite Straight Wire — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Magnetic Field of Finite Straight Wire This formula calculates the magnetic field strength at a point perpendicular to a straight wire segment, where the ends of the segment are defined by angles and relative to the perpendicular line. Apply the principle of superposition, considering the wire segment as two infinitesimal parts. Calculate the magnetic field contribution (dB) from an infinitesimal segment using the Biot-Savart Law. Integrate the contribution from the start angle ( ) to the end angle ( ) of the wire segment. The resulting integral yields the formula proportional to (sin + sin ). r > 0 0 is the permeability of free space (constant). Confusing the perpendicular distance (r) with the actual length of the wire segment. Forgetting the trigonometric summation term (sin + sin ), which is crucial for finite wires. Assuming the field strength is constant regardless of the position along the wire.