試題詳解

13. A rectangular loop of wire lies in the xy-plane with current I flowing in a clockwise direction when viewed from the positive z-axis. The loop dimensions are a along the x-axis and b along the y-axis. A uniform magnetic field B₀ along the positive z-direction is applied in the region. Using Ampere's Law, determine the net magnetic field at the center of the loop.
(A) B₀ along the positive z-direction
(B) B₀ along the positive x-direction
(C) B₀ along the negative y-direction
(D) B₀ along the negative z-direction
(E) 0