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Question
By using a compass needle describe how can you demonstrate that there is a magnetic field around a current carrying conductor.
Solution
Take a current and run it through a conductor AB in the diagram. Placing a compass needle close to the current carrying wire causes the compass needle to point in a specific direction. Changing the direction of the current causes the needle's deflection to shift as well.
That a magnetic field surrounds a current-carrying conductor is demonstrated by this.
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