This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.

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Answer
D. Compass
The correct answer is D.
A compass is a navigation instrument that uses a magnetized needle to align with the Earth's magnetic field, pointing towards magnetic North.
The instrument described in the question is a compass.
The final answer is
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The correct answer is D. A compass is a navigation instrument that uses a magnetized needle to align with the Earth's magnetic field, pointing towards magnetic North.
This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.