Question
What is an electromagnet?
✓
Answer
An electromagnet — An electromagnet is a temporary magnet which behaves as a magnet when electric current is passed through the insulated copper wire and loses its magnetism when current is stopped. It has a soft iron piece called the core with an insulated copper wire wound on it.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
By giving three examples define natural sources of light.
Define thermal expansion of gases.
Explain the construction and working of an electric bell with a labelled diagram.
Draw a neat diagram of a vacuum flask. Explain carefully how the heat losses due to conduction, convection and radiation are minimized?
The following diagram shows four circuits A, B, C and D. Each circuit has a cell and a torch bulb. Name the circuits in which the bulb will glow ? Give reason to your answer
Describe an experiment to prove (a) convection currents in liquids, (b) convection currents in gases.
State four characteristics of the image formed by a plane mirror.
Why is alcohol used as thermometric liquid in certain situations? Give two reasons.
A boy walks a distance 30 m in 1 minute and another 30 m in 1.5 minute. Describe the type of motion of the boy and find his average speed in m s-1.
State the unit of energy and define it.