A student observes that a compass needle deflects when brought near a current- carrying wire. Using your understanding of magnetic fields, explain why this happens.

Question

A student observes that a compass needle deflects when brought near a current- carrying wire. Using your understanding of magnetic fields, explain why this happens. — Exam MCQ

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A. A current-carrying wire creates a magnetic field that exerts a force on the compass needle. — A current-carrying conductor produces a magnetic field around it. This magnetic field exerts a torque on a nearby compass needle and makes it deflect.

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B. The wire causes a gravitational effect moving the needle.

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C. The wire heats up, causing air currents to move the needle.

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D. The wire produces an electric force that acts on the compass needle.

A student observes that a compass needle deflects when brought near a current- carrying wire. Using your understanding of magnetic fields, explain why this happens.

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