Devices consisting of a glass tube containing two small ferromagnetic reeds are called what?

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Multiple Choice

Devices consisting of a glass tube containing two small ferromagnetic reeds are called what?

Explanation:
A magnetic reed switch is built as two thin ferromagnetic reeds sealed in a glass tube. When a magnetic field is present, the reeds magnetize and pull together to close the circuit; remove the field, and they separate to open the circuit. This simple, passive, and hermetically sealed design makes it reliable and compact, ideal for door/window sensors and other low-power switches. Other options describe broader or different sensing technologies: a general contact switch covers any actuated switch; Hall effect sensors are solid-state and detect magnetic fields without moving parts; proximity sensors detect objects without physical contact using various principles. The glass-encased two-reed arrangement is the hallmark of a magnetic reed switch.

A magnetic reed switch is built as two thin ferromagnetic reeds sealed in a glass tube. When a magnetic field is present, the reeds magnetize and pull together to close the circuit; remove the field, and they separate to open the circuit. This simple, passive, and hermetically sealed design makes it reliable and compact, ideal for door/window sensors and other low-power switches. Other options describe broader or different sensing technologies: a general contact switch covers any actuated switch; Hall effect sensors are solid-state and detect magnetic fields without moving parts; proximity sensors detect objects without physical contact using various principles. The glass-encased two-reed arrangement is the hallmark of a magnetic reed switch.

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