Magnetism

[Primarygun]

I am confused of considering a solenoid with current as a magnet or by the Fleming's right-hand rule when doing some problems.

Here are some questions I am quite confused with:

1.Will a metal which can be attracted by a magnets be induced to be a magnet when it is put in a magnetic field?

2.Do the above metals have move along the field line when it is attracted?

3.When a magnet is near a solenoid with current, the current cause the solenoid to form a magnets. Hence, there's an attractive forces between them.

But, when the magnet moves towards it, by Fleming's right-hand rule, the solenoid will repel it, so what's the net movement of the two things?

4.Why do compasses point towards magnetic south pole instead of moving towards it?

Thanks

[swansont]

I am confused of considering a solenoid with current as a magnet or by the Fleming's right-hand rule when doing some problems.

Here are some questions I am quite confused with:

1.Will a metal which can be attracted by a magnets be induced to be a magnet when it is put in a magnetic field?

2.Do the above metals have move along the field line when it is attracted?

3.When a magnet is near a solenoid with current' date=' the current cause the solenoid to form a magnets. Hence, there's an attractive forces between them.

But, when the magnet moves towards it, by Fleming's right-hand rule, the solenoid will repel it, so what's the net movement of the two things?

4.Why do compasses point towards magnetic south pole instead of moving towards it?

Thanks[/quote']

 

1. No. There are different types of magnetism (ferro-, para- and diamagnetism) Ferromagnets are the ones that can become permanent magnets.

 

2. No, there can be other motion present.

 

3. I think you're looking at Lenz's law here. Any current (and thus field) induced by the free motion of the magnet will be smaller than the original current or field.

 

4. The force isn't strong enough. The earth's field is only about a gauss.

[Primarygun]

Sorry, I know what you mean.

1.For the first question, I want to ask "Will it be a induced magnet for that moment in the field?"

4.A compass is a magnet, by using which law can I figure out the final direction of north pole of the needle?

Thanks