ALL PHYSICS DOUBTS - POST HERE !!

[WARRIOR]

Thanks

oooooooooooops wrong explanation !!!!!!

look elcectro magnets are made of iron...temporary magnets...so when elecrtromagnet is switched off..iron stops workin and it looses it magnetism!!!!!!

get my point?

[Ghost Of Highbury]

How

See below.

Boiling water, Melting Ice. Mark 0 degree and 100 degree Celsius. draw equal divisions..

[Dana]

oooooooooooops wrong explanation !!!!!!

look elcectro magnets are made of iron...temporary magnets...so when elecrtromagnet is switched off..iron stops workin and it looses it magnetism!!!!!!

get my point?

hahaha yes I got that a loong time ago xD isn' that what you said the first time? I couldn't really get it cuz of the slang sorry  

[Weaam]

https://studentforums.biz/index.php/topic,7946.msg210346.html#msg210346

Thanks! or rather, i have to be thanking Kimo

[~HyDrOgEn~]

Yo, anyone can help me with this question:
May/June 2005, paper 1 , Question 27, what is that!!

[OBADATH]

what about the (corning waves)!!!!
please help..exam in two hours

[Ghost Of Highbury]

Yo, anyone can help me with this question:
May/June 2005, paper 1 , Question 27, what is that!!

A - both point towards north

[Ivo]

Can anyone please clear doubt about magnetism.  So ferrous materials can be magnetised (e.g. iron and steel).  All ferrous materials can be magnetically induced (so both sides of a magnetic object attracts).  

However, a magent has poles.  To make magnet, you place in d.c. current.

I'm not sure, but am i right in saying that in magnetic induction, the thing being induced is not a magnet, because it does not have magnetic field lines?

By the way, iron is magnetically soft, so loses magnetism easily right?

Please please can someone clarify thins, thanks!

[the_grim_reaper]

Noooo I wanna know if it was easy or difficult! So i can brace myself uno?
I'm doing it in Saudi too! Which city are you in?

The great city of Riyadh lol. With Minarat-ar-Riyadh as my centre and an invigilator who scares the heck out of me evrytime I see him. You should never try to know how easy or hard a paper was. If it was easy, you'll get over-confident. If it was hard, you'll already be freaked out and u'll screw you're grade. Besides, it's a different varient too so it's useless to find out if the other varient was easy or hard...

[Ghost Of Highbury]

Please please can someone clarify thins, thanks!

yes, because it doesnt hav magnetic field.

[Dana]

Please please can someone clarify thins, thanks!

I didn't really understand everything you said but yes to magnetise a material you wound a coil over it and pass a d.c. through the coil. And yes iron is magnetically soft thus loses magnetism easily and is used as the core of an electromagnet.
Umm what else? Ferrous substances are the ones that have alot of Iron.. I dno if ALL of them can be magnetised though
hope I helped

[Ivo]

I didn't really understand everything you said but yes to magnetise a material you wound a coil over it and pass a d.c. through the coil. And yes iron is magnetically soft thus loses magnetism easily and is used as the core of an electromagnet.
Umm what else? Ferrous substances are the ones that have alot of Iron.. I dno if ALL of them can be magnetised though
hope I helped

So what's the difference between magentic induction and magnetising magnet then?  Like passing through dc and stuff

[Dana]

The great city of Riyadh lol. With Minarat-ar-Riyadh as my centre and an invigilator who scares the heck out of me evrytime I see him. You should never try to know how easy or hard a paper was. If it was easy, you'll get over-confident. If it was hard, you'll already be freaked out and u'll screw you're grade. Besides, it's a different varient too so it's useless to find out if the other varient was easy or hard...

Ahh yes I used to live in Riyadh now I live in Khobar. How is it there?
Haha we have a pretty > invigilator too. Gives the dirtiest looks you'll ever see -.- Almost got kicked out of my bio exam cuz i forgot my statement of entry  
Yeaa I guess, but usually variants are pretty similar in paper 1. I dno I still love to know whether it was easy or difficult
where ru from?

[Ghost Of Highbury]

So what's the difference between magentic induction and magnetising magnet then?  Like passing through dc and stuff

magnetising magnet......... huh?? didnt get u

[Dana]

So what's the difference between magentic induction and magnetising magnet then?  Like passing through dc and stuff

Magnetic induction is when you magnetise a metal by bringing another magnet close to it but not touching I think. And when you take it away it's not a magnet anymore. Magnetising is more permanent I guess. And can be done by electricity, hammering etc