A compass works with the help of ______________.

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Solar energy

Moon’s gravity

Earth’s magnetic field

Earth’s gravity

answer is C.

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Detailed Solution

Concept: Magnetism serves as the foundation for how the compass functions. It is based on the observation that a bar magnet will align itself with the geographic north-south direction when hanging freely in the air with the aid of a thread or string.
The outer liquid core and the inner iron core of the Earth both revolve and spin, creating a magnetic field surrounding the planet, which is why it is referred to as a big bar magnet. Each magnet will have a north pole and a south pole, and the magnet of the Earth is no different.
The compass needle is made up of a needle that may freely move since it is mounted on a pivot or pin. Because it is magnetic, the compass needle will interact with the bar magnet inside the Earth. The fundamental tenet of magnetism is that dissimilar poles attract and like poles repel. Thus, it is in the north when the compass needle points north.
Magnetism serves as the foundation for how the compass functions.
It is based on the observation that a bar magnet will align itself with the geographic north-south direction when hanging freely in the air with the aid of a thread or string.
Hence, the correct option is 3 .

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