일반물리학 2 — Magnetic Fields Due to Currents: Problem 23

23 Figure 29-38 shows a cross section across a diameter of a long cylindrical conductor of radius \( a = 2.00 \text{ cm} \) carrying uniform current \( 170 \text{ A} \). What is the magnitude of the current’s magnetic field at radial distance (a) \( 0 \), (b) \( 6.00 \text{ mm} \), (c) \( 2.00 \text{ cm} \) (wire’s surface), and (d) \( 5.90 \text{ cm} \)?