by Ron Kurtus

A total of 673 comments and questions have been sent in. They are listed according to date.

## List of next 10 letters

### Country

Magnetism Increasing magnetic force Philiippines

Basics of Magnetism Magnets repel each other Ghana

Basics of Magnetism Putting two south poles near each other Philippines

Electromagnetism Would electricity exist without atoms? Nigeria

Basics of Magnetism Move iron rod around a magnet India

Electromagnetism Difference between electromagnet and permanent magnet India

Magnets North pole of Earth and north end of magnet India

Magnets Relationship between a magnet and electricity? Botswana

Basics of Magnetism Seeking information on electricity and magnetism Botswana

Solenoids Using a solenoid with 150 turns of winding South Africa

Next 10

First 10 letters

## Increasing magnetic force

Topic: Magnetism

### Question

December 21, 2013

can magnetic force be increased and decreased?

julius - Philiippines

24365

An electromagnet allows you to increase or decrease a magnetic field by changing the current through the electromagnet. See Basics of Electromagnetism for more information.

## Magnets repel each other

Topic: Basics of Magnetism

### Question

December 4, 2013

How magnetic are never close to each other,

james - Ghana

24242

If you try to put the same poles of two magnets together, they will repel more the closer they get. This is because the magnetic fields push them apart and the repelling force is inversely proportional to square of the separation. That means that the force pushing them apart at 1mm is 100 times as great as when they are 1cm apart.

## Putting two south poles near each other

Topic: Basics of Magnetism

### Question

November 11, 2013

Greetings...

Like charges/poles exert repulsive forces. There are always diagrams about the north poles or the positive charges wherein they show how their lines of force "push" each other.

I humbly ask, "in the case of negatives and south poles, how do the field lines interact and repel?"

Thank you...

24181

The magnetic field lines go from the north to the south pole in a loop. (The direction is by convention). Thus, when you place two south poles near each other, the lines repel that same as for two north poles.

## Would electricity exist without atoms?

Topic: Electromagnetism

### Question

October 30, 2013

Would electricity exist without atom? pls explain better

David - Nigeria

24151

Electricity is usually defined as the flow of electrons. You can have a stream of electrons moving through empty space. However, the electrons must start and end with matter consisting of atoms. Also, electric current usually requires a wire made up of a conducting metal.

## Move iron rod around a magnet

Topic: Basics of Magnetism

### Question

October 20, 2013

What will happen if, we place a magnet at an iron rod which is moving around that magnet.

Umamaheswara Sharma - India

24114

Of course, the iron rod would be attracted to the magnet and perhaps come into contact with it.

If the rod was able to rotate around the magnet and there were wires attached to each end of the rod, completing an electrical circuit, electrical current could be generated.

## Difference between electromagnet and permanent magnet

Topic: Electromagnetism

### Question

October 17, 2013

how an electromagnet differs from a permanent magnet?

- India

24104

A permanent magnetic always has a magnetic field that will attract iron. An electromagnet allows you to turn the magnetic field on or off by turning the electrical power to the wires on or off. That makes the electromagnet very useful in various devices.

## North pole of Earth and north end of magnet

Topic: Magnets

### Question

October 8, 2013

Why does a magnetic always shows nort and south directions ....?
North pole of earth and north pole of magnet should repeal each other but why does it not happen......?

DEEPAK - India

24084

Magnets have magnetic poles that are opposite each other. By convention, they were named north and south.

For an explanation, see Confusion About the North Magnetic Pole.

## Relationship between a magnet and electricity?

Topic: Magnets

### Question

September 11, 2013

what is the relationship between a magnet and electricity?

HLOMANI - Botswana

24008

A magnet is usually a solid material that attracts iron and other magnets. Electricity is the flow of electrons through a wire.

However, the movement of a wire through a magnetic field can create electricity in the wire.

## Seeking information on electricity and magnetism

Topic: Basics of Magnetism

### Question

September 11, 2013

Iam starting an electric course but I would like you to send me information on electricity starting from magnetism. secondly I wannaa know how the magnetisim work in a contactor?

Hlomani - Botswana

24007

See the listing of lessons at Electricity and Magnetism.

## Using a solenoid with 150 turns of winding

Topic: Solenoids

### Question

August 28, 2013

What will happen when you are using 1 and a solenoid of 150 turns of winding

Khutso - South Africa

23974

The number of windings in a solenoid are important, but the field also depends on the voltage and current through the wire.

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