Electromagnetism questions | form four Physics

Describe the structure and mode of action of a simple d.c. motor.

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UNSOLVED

Draw a diagram of an electric bell showing the polarity of the electromagnet, the direction of the current, the core, the yoke, spring and the armature.

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UNSOLVED

Explain what will happen to the mode of action of the electric bell if the core and yoke are made of steel instead of soft iron.

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UNSOLVED

Which one is not a region of electromagnetic spectrum?

1. Radio waves
2. X-rays
3. Infrared lights
4. Ulltraviolet light
5. Invisiblle light waves.

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UNSOLVED

Which of the following electromagnetic waves is used to detect flaws and defects in steel plates?

1. infrared waves
2. ultraviolet waves
3. x­rays
4. gamma rays
5. micro waves.

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UNSOLVED