Which device is described as a fast-acting, single-pole, single-throw switch with NO contact?

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Multiple Choice

Which device is described as a fast-acting, single-pole, single-throw switch with NO contact?

Think of this as a simple magnetic switch that closes a circuit when a magnet is near. A magnetic reed switch contains two small ferromagnetic reeds inside a sealed glass envelope. When no magnetic field is present, the reeds stay apart, so the circuit is open. When a magnetic field appears, the reeds are drawn together and touch, completing the circuit—this is a fast-acting response. Because there are just two terminals and one contact pair, it behaves as a single-pole, single-throw switch. The configuration described as normally open means the default state is open and it closes only when the magnetic field is present, which matches how a reed switch typically operates. Other options don’t fit because a photoelectric sensor uses light to detect presence and doesn’t rely on a mechanical contact; a capacitive switch detects changes in capacitance rather than making a contact; a Hall effect sensor is a solid-state device that provides an electrical signal in response to a magnetic field but doesn’t involve a physical contact switch.

Think of this as a simple magnetic switch that closes a circuit when a magnet is near. A magnetic reed switch contains two small ferromagnetic reeds inside a sealed glass envelope. When no magnetic field is present, the reeds stay apart, so the circuit is open. When a magnetic field appears, the reeds are drawn together and touch, completing the circuit—this is a fast-acting response.

Because there are just two terminals and one contact pair, it behaves as a single-pole, single-throw switch. The configuration described as normally open means the default state is open and it closes only when the magnetic field is present, which matches how a reed switch typically operates.

Other options don’t fit because a photoelectric sensor uses light to detect presence and doesn’t rely on a mechanical contact; a capacitive switch detects changes in capacitance rather than making a contact; a Hall effect sensor is a solid-state device that provides an electrical signal in response to a magnetic field but doesn’t involve a physical contact switch.

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