As the current in the copper wire increases, the deflection of the compass needle also increases. This indicates that the magnitude of the magnetic field produced at a given point increases with an increase in current.
What happens to the deflection of the compass needle if the current in the copper wire is increased?
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The deflection of a compass needle near a current-carrying wire is governed by the right-hand rule. According to this rule, if you grasp the wire with your right hand, with your thumb pointing in the direction of the current, and your fingers encircling the wire, the magnetic field lines around the wire will follow the direction of your fingers.
If you increase the current flowing through the wire, the magnetic field produced around the wire becomes stronger. This, in turn, affects the deflection of the compass needle. The compass needle aligns itself with the magnetic field lines, so an increase in current results in a stronger magnetic field, leading to a greater deflection of the compass needle.
In summary, increasing the current in the copper wire increases the strength of the magnetic field around the wire, leading to a larger deflection of the compass needle.