A magnetic reed switch only has how many connections and is not polarity sensitive?

• A. One
• B. Two
• C. Three
• D. Four

Answer: (B)

A magnetic reed switch is a two-terminal, non-polar device that acts like a simple contact. It has two metal reeds inside a sealed glass envelope, and these reeds touch to close the circuit when a magnetic field is present. Since there are only two terminals—one for each reed—it has two connections, and there’s no polarity to consider because it’s just a mechanical switch, not a diode or other polarity-sensitive component. A single connection couldn’t form a complete circuit, and three or four terminals would indicate a more complex device than a simple reed switch. That’s why two connections is the correct answer.