Electromagnet

What are electromagnets?

• Magnets through which current can pass

• Magnets made by electricity

• Magntes that can make electricity

• Magnets that creates current

What is the core of an electromagnet made of?

• Magnet

• Iron

• any magnetic material

• earth's core

Magnetism is an example of

• magnets

• Study of magnets

• non-contact force

• contact force

How do we make the electromagnets stronger?

• Using bigger magnets.

• Increasing current

• decreasing current

• Making larger magnets.

How do we make the electromagnets stronger?

• Using bigger magnets.

• Using magnetic poles

• Increasing number of coils

• Decreasing number of coils

What is the relation between strength of magnet and current?

• Higher current weaker magnet

• Lower current stronger magnet

• strength does not depend on current.

• Higher current stronger magnet

What is the relation between strength of magnet and coils?

• Higher the number of coils, weaker the magnet

• Higher the number of coils, stronger the magnet

• strength does not depend on number of coils

• Higher number of magnets, stronger the coils.

Electromagnets are ---------------------------

• controllable

• Uncontrollable

• Natural magnets

• Electronic magnets

An electromagnet can be easily demagnetized by ------------------

• Heating

• using a magnet

• switching off the current.

• using a non magnetic material

Electromagnets were first discovered in the 19th century by Danish scientist -----------------

• David Humphry

• Daniel Magneto

• Albert Einstein

• Hands Christian Orsted.