Electromagnetic Induction Review

Front

What is electromagnetic induction?

Back

Electromagnetic induction is the process of generating electric current in a conductor by changing the magnetic field around it.

Front

What material is commonly used as the core of an electromagnet?

Back

Iron is commonly used as the core of an electromagnet because it enhances the magnetic field.

Front

What happens to the strength of an electromagnet when more coils are added?

Back

The strength of the electromagnet increases when more coils are added.

Front

What type of current does a transformer work with?

Back

A transformer works with alternating current (a.c.) only.

Front

What occurs when a bar magnet is moved in and out of a coil of wire?

Back

Electric current will flow through the wire when a bar magnet is moved in and out of it.

Front

Can a stationary magnet produce current in a wire?

Back

No, the magnetic field has to be changing to excite the electrons and produce current.

Front

What is the role of a core in an electromagnet?

Back

The core enhances the magnetic field produced by the coils of wire.

Front

What is the relationship between the number of coils and the strength of an electromagnet?

Back

More coils result in a stronger electromagnet due to increased magnetic field lines.

Front

What is the principle behind a transformer?

Back

A transformer operates on the principle of electromagnetic induction to transfer electrical energy between circuits.

Front

What is the effect of using a non-magnetic core in an electromagnet?

Back

Using a non-magnetic core will result in a weaker magnetic field compared to using a magnetic core.