Physics - Doubts in the syllabus

[unplugged]

Thank you very much, unplugged. That was helpful
Are you sure that positive charges are attracted to the south pole and negative ones to the north pole?

The information he gave you concerning that point is wrong, north and south poles are not the same as positive and negative charges.

To determine where radiation is deflected in a magnetic field, Fleming's left hand rule is used. It's explained here: http://www.furryelephant.com/content/ra ... lpha-beta/

Hmm, well i did see it on a few forums. But i suppose it does seem kinda of wrong.


Some helpful thing i saw on wiki about the magnetic field created by current:

 

[lavanyamane]

http://www.xtremepapers.me/CIE/Cambridg ... _qp_32.pdf
Q.8 (c)(iii)
Why do charges move up to the ball?

 

[lavanyamane]

and Q. 9(b)(i) ??!!!

 

[unplugged]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0625%20-%20Physics/0625_s10_qp_32.pdf
Q.8 (c)(iii)
Why do charges move up to the ball?

You can imagine the ball having two sections when the Positively charged rod is brought near it , a section on the side of the rod in which electrons gather up and a side where there are no electrons or AKA positively charged side. When you connect the line from the earth , the earth is a neutral object so electrons in the earth being attracted to the positive charge in MOST of the ball move up from the earth to the ball till they fill the empty spaces (holes). And as a result the ball has extra electrons and therefore negatively charged.

 

[lavanyamane]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0625%20-%20Physics/0625_s10_qp_32.pdf
Q.8 (c)(iii)
Why do charges move up to the ball?

You can imagine the ball having two sections when the Positively charged rod is brought near it , a section on the side of the rod in which electrons gather up and a side where there are no electrons or AKA positively charged side. When you connect the line from the earth , the earth is a neutral object so electrons in the earth being attracted to the positive charge in MOST of the ball move up from the earth to the ball till they fill the empty spaces (holes). And as a result the ball has extra electrons and therefore negatively charged.

Thank you! And what about Q. 9(b)(i) in the same paper? Could you help me with that?

 

[unplugged]

Thank you! And what about Q. 9(b)(i) in the same paper? Could you help me with that?

I'm not totally sure about this but , i think when there are two routes between the terminals. One which has a lot less resistance than the other , the circuit is shortened and the current only flows through the path of least resistance. Try to confirm this with someone that has more experience but i think it's about right.