(Solved): Deflecting a compass needle When you bring a current-carrying wire down onto the top of a compass, ...

Deflecting a compass needle When you bring a current-carrying wire down onto the top of a compass, aligned with the original direction of the needle and \( 5 \mathrm{~mm} \) above the needle, the needle deflects by \( \theta=18 \) degrees (see the figure). (a) Which of the following statements are correct? Select all that apply. Conventional current in the wire is flowing downward (South). The magnetic field under the wire, due to the current, points to the East. Electron current in the wire is flowing upward (North). The magnetic field under the wire, due to the current, points to the West. The magnetic field under the wire, due to the current, points North. Conventional current in the wire flows upward (North). (b) Calculate the amount of conventional current flowing in the wire. The measurement was made at a location where the horizontal component of the Earth's magnetic field is \( B_{\text {Earth }} \approx 2 \times 10^{-5} \) tesla. \( \times \mathrm{A} \)