일반물리학 2 — Magnetic Fields Due to Currents: Problem 3

3 In Fig. 29-24, point \( P_2 \) is at perpendicular distance \( R = 25.1 \text{ cm} \) from one end of a straight wire of length \( L = 13.6 \text{ cm} \) carrying current \( i = 0.500 \text{ A} \). (Note that the wire is not long.) (a) What is the magnitude of the magnetic field at \( P_2 \)? (b) If the point of measurement is moved from \( P_2 \) to \( P_1 \), does the field magnitude increase, decrease, or remain the same?