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Why are electromagnets more useful than bar magnets?

The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.

Is bar magnet stronger than electromagnet?

The coil shape forces the magnetic field of the current into a special configuration. All the fields of each loop of the coil line up so that the effect is that of a natural bar magnet. The iron core reinforces the field of the wire, making the electromagnet stronger.

What is a difference between electromagnets and bar magnets?

Hint The basic difference between them is that a bar magnet is a permanent magnet whereas an electromagnet is a temporary magnet. An electromagnet is formed when an electric current is passed through wires wound around soft metalcore. An electromagnet loses its magnetism once the current flow is stopped.

Which student group built the strongest electromagnet?

Group Number of Loops/Coils Battery Voltage Core Use 1 15 12v No nail 2. 10 6 v Iron nail 3 10 6 v No nail 4 15 12 v Iron nail Which student group built the strongest electromagnet? Group 4, because the strength of the electromagnet depends directly on the number of loops, current passing through it.

What can LISA do to increase the strength of the electromagnet?

What can Lisa do to increase the strength of the electromagnet? She can use a nail with weaker magnetic properties.

What electromagnet would have the most strength?

D: An electromagnet with 20 coils. That is because the more coils of the wire, the stronger the electromagnet is.

What can LISA do to increase the strength of the electromagnet quizlet?

How do you increase the strength of an electromagnet? Increase the number of coil turns. Increase the current. Add an iron core.

What will happen if a bar magnet is cut into half?

Each one reinforces the magnetic fields of the others. Each one has a tiny north and south pole. If you cut one in half, the newly cut faces will become the new north or south poles of the smaller pieces.

Why should a magnet not be kept near a computer?

a magnet should not br kept near a computer because strong magnet can damage the computer hard drive.

What happens if an iron bar magnet is melted?

No, iron bar loses magnetism when melted. When heated the arrangement of molecules becomes random and the iron bar loses its magnetism.

Does an iron bar magnet retain its magnetism Whenmelted Givereasonforyouranswer?

Give reason for your answer. The melting temperature of Iron is very high and iron melts at a temperature which is higher than the Curie temperature of iron. So, the iron bar magnet cannot retain its magnetism when melted.

What are the two ends of a bar magnet called?

A bar magnet has two magnetic poles: north pole (or north-seeking pole) south pole (or south-seeking pole)

Can a magnet change a compass?

Another magnet near the compass needle imposes a magnetic field upon the compass needle. It is a matter of the strength of the magnetic field imposed upon the compass needle and the coercivity of the needle material whether or not the magnetic properties of the compass needle are damaged.