$A$ magnetic compass shows a deflection when placed near a current-carrying wire. How will the deflection of the compass be affected if the current in the wire is increased? Support your answer with a reason.

(N/A) The deflection of the magnetic compass increases.
Reason: The strength of the magnetic field produced by a current-carrying straight conductor is directly proportional to the magnitude of the current flowing through it $(B \propto I)$. Therefore,increasing the current increases the magnetic field strength,which exerts a greater force on the magnetic needle,resulting in a larger deflection.