Chapter 6: Problem 63

Write the uses of electromagnets.

Short Answer

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Question: List and briefly describe six common applications of electromagnets in modern technology.

Step by step solution

1. Electric motors and generators

Electromagnets are a crucial component in electric motors and generators. They are used to create a rotating magnetic field, which induces an electric current in the coils surrounding it. This current can drive the motor or be harnessed as electrical power in a generator.

2. Electromagnetic cranes

In scrapyards and other industrial settings, electromagnetic cranes are employed to lift and move heavy, magnetic materials (such as iron and steel) with ease. By supplying electricity to the electromagnet, a strong magnetic field is created, enabling the crane to pick up and transport large amounts of metal.

3. Magnetic levitation trains

Also known as Maglev trains, these vehicles use electromagnets to levitate above the tracks, minimizing friction and allowing for higher speeds and smoother rides. This is achieved by the interaction between the electromagnets on the train and those on the rails, which propel the train forward.

4. Magnetic resonance imaging (MRI)

Electromagnets are crucial in MRI scanners, which are widely used in medical diagnostics. These machines generate strong magnetic fields using electromagnets. These fields, along with radio waves, create detailed images of the inside of the human body to aid in diagnosing various conditions.

5. Electromagnetic relays

Relays are electrical switches that use electromagnets to open and close circuits. When a current is applied to the electromagnet, it generates a magnetic field that pulls a movable contact towards it, closing the circuit. This allows for the control of high-voltage circuits with a low-voltage trigger.

6. Magnetic locks

Often used in security systems, magnetic locks employ electromagnets to create a strong, secure bond between a door and its frame. When an electric current is applied, the electromagnet generates a magnetic field that attracts a metal plate attached to the door, holding it securely in place. Overall, electromagnets play a significant role in various industries and everyday applications due to their versatile and controllable nature.

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Write the uses of electromagnets.

Short Answer

Step by step solution

1. Electric motors and generators

2. Electromagnetic cranes

3. Magnetic levitation trains

4. Magnetic resonance imaging (MRI)

5. Electromagnetic relays

6. Magnetic locks

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