Question

A 6.0 A current is charging a 1.4 -cm-diameter parallel-plate capacitor. What is the magnetic field strength at a point 2.2 mm radially from the center of the wire leading to the capacitor? Express your answer to two significant figures and include the appropriate units. B = What is the magnetic field strength at a point 2.2 mm radially from the center of the capacitor? Express your answer to two significant figures and include the appropriate units. B =

Answer 1

a) B = mu₀ I / 2 pi r = (4 pi * 10^-7 * 6) / (2 pi * 2.2 * 10^-3)

= 5.45 * 10^-4 T

b) B = mu₀ / 2 pi * [r/R²] * dq/dt

= (4 pi * 10^-7 * 2.2 * 10^-3 * 6) / (2 pi * (0.7 * 10^-2)²)

= 5.39 * 10^-5 T