Attraction type moving iron instruments are also called:

Moving iron instruments

• The instrument in which the moving iron is used for measuring the flow of current or voltage is known as the moving iron instrument. It works on the principle that the iron placed near the magnet attracts it.
• The force of attraction depends on the strength of the magnet field. The magnetic field induces by the electromagnet whose strength depends on the magnitude of the current that passes through it.
• Moving iron instruments operate on the principle of attraction and can be classified into attraction-type and repulsion-type.
• Attraction-type moving iron instruments are sometimes referred to as single iron type instruments because they typically have a single piece of iron that moves in response to the magnetic field produced by the coil.