In a relay, which part is stationary and provides the magnetic path?

In a relay, which part is stationary and provides the magnetic path?

• A. Armature
• B. Coil
• C. Contact
• D. Frame

Answer: (D)

In a relay, the stationary part that provides the magnetic path is the frame. When the coil is energized, it generates a magnetic field that travels through the frame (the magnetic yoke) to form a complete magnetic circuit. This fixed frame supplies the low-reluctance path for the flux, while the armature—the moving piece—is drawn into the field to actuate the contacts. The coil supplies the magnetomotive force, but the frame is what carries the magnetic flux and stays in place, forming the path for the magnetic circuit.

In a relay, the stationary part that provides the magnetic path is the frame. When the coil is energized, it generates a magnetic field that travels through the frame (the magnetic yoke) to form a complete magnetic circuit. This fixed frame supplies the low-reluctance path for the flux, while the armature—the moving piece—is drawn into the field to actuate the contacts. The coil supplies the magnetomotive force, but the frame is what carries the magnetic flux and stays in place, forming the path for the magnetic circuit.