Figure shows cross section of two large parallel metal sheets carry...

Figure shows cross section of two large parallel metal sheets carrying electric currents along their surfaces. The current in each sheet is \( \frac{10}{\pi} \mathrm{A} / \mathrm{m} \) along the width. Consider two points \( \mathrm{A} \) and \( \mathrm{B} \), as shown in the figure with their positions.
(A) Magnetic field at \( A \) is \( 4 \mu T \) along \( x \)-direction.
(B) Magnetic field at \( A \) is \( 4 \mu T \) along negative \( x \)-direction.
(C) Magnetic field at \( B \) is zero.
(D) Magnetic field at \( B \) is \( 2 \mu \mathrm{T} \) along \( x \)-direction.