Question

This device is based on direct application of electromgnets

Answer 1

You can consider many Kitchen Items...

Induction Stove

Oven

Mixture Grinder

Answer 2

Answer:

Various sensors and actuating devices are works based on electromagnetism. Electromagnetic sensors include Hall-effect sensors, magnetoresistive sensors, fluxgate sensors, etc. These sensors convert the physical quantity such as flow, pressure, level, proximity, etc into an electrical signal.