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Physics P3 27/5/2010

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Malak:
Can u explain how do we find the direction an alpha or beta particle travels through magnetic feild?
And wats the basic difference between electric and magnetic field...Always confuses me :D

Thx

WARRIOR:
electric field you always have two plates Positve and negative ( electric )

in this case alpha ( + ) move to the negative   / Beta ( - ) move to the posotive plate


Magenetic field

you have  2 poles.. NORTH POLE AND SOUTH pole.. THE MAGNETIC FIELD IS ALWAYS FROM NORTH TO SOUTH

This is a bit hard to find the direction but if u understand the folowing its pice of cake

We use FLEMMING LEFT HAND RULE TO FIND THE DIRECTION OF OF MOVEMENT OF WIRE  ( CONVECTIONAL CURRENT IN WIRE )
We know that electrons ( beta )  flow opposite to convectional current . And since electrons move opposite to convectional current that means alpha particles move opposite to beta . ( IN CONCLUSION )

IF YOU FIND USING FLEMMIN LEFT HAND RULE DIRECTION OF MOVEMENT  YOU FIND THE CONVECTIONAL CURRENT AND ALPHA
if you want to find movement of beta particles ..just fidn the movemnt of convectional current and and beta will move opposite.

Vin:

Also try this site ..

http://www.furryelephant.com/content/radioactivity/discovery-radioactivity-nucleus/flemings-left-hand-rule-alpha-beta/

Ivo:
OK, Kimo Jesus has asked me to post this, in response to the question found in attached file:


--- Quote ---The answer is A, because if thicker wires are used, resistance is less, so current is less, as voltage is constant (I=V/R).

In transformers, for the same power, voltage is increased and so current has decreased, so there is less heat (I=P/V).
--- End quote ---

This is Extension material apparantly (the transformers and the grid stuff), so get learning for Paper 3 :D

SoONa:

--- Quote from: ~VIN1094~ on May 22, 2010, 02:48:33 pm ---i think "quantity of charge" means "amount of charge" Coulombs

Q = It

is tht wat u mean Soona ??

--- End quote ---

YuPP exactly but the notes made it very weird... Thanks alot

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