Non-contact Forces

Front

What is an electromagnet and how can its strength be increased?

Back

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Its strength can be increased by increasing the number of coils around the iron core, increasing the current flowing through the coils, or using a ferromagnetic core.

Front

What happens to the strength of a magnet when the coil around its core is loosened?

Back

Loosening the coil around the iron core of an electromagnet will decrease its strength.

Front

How can you determine which magnet is the strongest in an experiment?

Back

You can determine the strongest magnet by measuring how many paper clips or other objects each magnet can pick up; the one that picks up the most is the strongest.

Front

What is static electricity and how can it be demonstrated?

Back

Static electricity is the accumulation of electric charge on the surface of objects. It can be demonstrated by rubbing a balloon against hair, which transfers electrons and creates a charge imbalance.

Front

What charge does a rubber balloon acquire when rubbed against hair?

Back

The rubber balloon acquires a negative charge when rubbed against hair, as it picks up electrons from the hair.

Front

What is the relationship between electric charge and attraction?

Back

Opposite charges attract each other, while like charges repel each other. For example, a negatively charged balloon will be attracted to a positively charged glass rod.

Front

Can electromagnets be turned on and off?

Back

Yes, electromagnets can be turned on and off by controlling the electric current flowing through them.

Front

What is the effect of bringing a positively charged object near a negatively charged object?

Back

When a positively charged object is brought near a negatively charged object, they will attract each other.

Front

What is the principle behind the operation of an electromagnet?

Back

The principle behind an electromagnet is that an electric current produces a magnetic field, which can magnetize a ferromagnetic material.

Front

What materials are typically used as cores in electromagnets?

Back

Ferromagnetic materials such as iron, nickel, or cobalt are typically used as cores in electromagnets to enhance their magnetic field.