Where are the magnets mounted on a compass card?

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Multiple Choice

Where are the magnets mounted on a compass card?

The direction shown by a compass card relies on a stable magnetic influence, and that comes from magnets that are fixed in the compass frame. Placing magnets on the frame keeps the magnetic field constant relative to the card as it rotates, giving a smooth, accurate indication. If the magnets were mounted on the card itself, the magnetic forces would move with the card and readings could become unstable or erratic. So the magnets are mounted to the frame to provide a consistent reference for the rotating card.

The direction shown by a compass card relies on a stable magnetic influence, and that comes from magnets that are fixed in the compass frame. Placing magnets on the frame keeps the magnetic field constant relative to the card as it rotates, giving a smooth, accurate indication. If the magnets were mounted on the card itself, the magnetic forces would move with the card and readings could become unstable or erratic. So the magnets are mounted to the frame to provide a consistent reference for the rotating card.

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