ALL PHYSICS DOUBTS - POST HERE !!

[Vin]

not giving

what answer r u getting ?? n which angle r u measuring ?? nothings given in the ms means the examiner will check according to what u hav done

[lmfao]

thanks

[MasterMath]

Can you explain how PE and KE of water molecules change when evaporation occurs ?

When your adding heat for the water to evaporate .. First of all it happens at a constant temperature .. and we all know that Average K.E isProportional to Temp .. so K.E does not increase while evaporation is taking place because the temperature is constant .. but what happens to the heat we are adding? The heat we are adding is to provide G.P.E to the molecules so they can overcome the forces of attraction between the molecules of the liquid and thus leave the surface of water and then end up having much more G.P.E in the gas state.
Hope this helps!

[Vin]

Yes Vin it says that in the mark scheme but why for Q does it point to the left could you explain ..??

ok .. remember ALWAYS a compass North (compass point) points in the SAME direction as the direction of current .. This is Oersted's Discovery

[8T]

ok .. remember ALWAYS a compass North (compass point) points in the SAME direction as the direction of current .. This is Oersted's Discovery

OOOOOH!
I knew that it just slipped..
Many thanks Bud (:

[The Golden Girl =D]

june 2003 ....Q10 part bi

[Raywin]

june 2003 ....Q10 part bi

(i) By increasing the current, the magnetic field lines is ONLY stronger. It does not change direction. It is the SAME.

(ii) By reversing the direction of current, the magnetic field reverses and so the compass points in the OPPOSITE direction.

[holtadit]

This question has been bugging me. I saw it in a few GCE past papers.

You know that diagram for Lenz's Law in all textbooks ? It shows a magnet entering a solenoid....

okay, How do I predict which way the Galvananometer or ammeter will defelct ? Like will go tot the right or left and why ?

Like in the diagram below :

Which way does the ammeter  pointer deflect towards ? Left or right ?

[jellybeans]

HI!!!! need some help here... are my answers right..? or wrong.. hehhs,
help pleaseee


... helllllppp .. dont really know what the MS's talking about...

[Raywin]

This question has been bugging me. I saw it in a few GCE past papers.

You know that diagram for Lenz's Law in all textbooks ? It shows a magnet entering a solenoid....

okay, How do I predict which way the Galvananometer or ammeter will defelct ? Like will go tot the right or left and why ?

Like in the diagram below :

Which way does the ammeter  pointer deflect towards ? Left or right ?

I THINK when the magnet is first put into the solenoid, the ammeter moves to the right. Then when the magnet is pulled out, the ammeter moves to the left? Im not really sure as to WHY it does this but positive it moves in this manner

[Vin]

I think when the magnet is entering it deflects to the right ..  because that is when the pd in induced .. and the polarity of the solenoid is North which opposes the magnet to induce the pd

while removing the meter should deflect to the left because according to Lenz's law wen the mag. is removed the solenoid becomes South and attracts the mag.

[ambitious94]

This question has been bugging me. I saw it in a few GCE past papers.

You know that diagram for Lenz's Law in all textbooks ? It shows a magnet entering a solenoid....

okay, How do I predict which way the Galvananometer or ammeter will defelct ? Like will go tot the right or left and why ?

Like in the diagram below :

Which way does the ammeter  pointer deflect towards ? Left or right ?

Ok, for this first u have to determine the North and South poles of the solenoid. That u have to determine by Lenz's law. Now North always has anticlockwise current right? So u simply draw the arrow for the direction of current. The Ammeter needle will deflect in the direction of the current. Simple. like in the case of ur diagram, it will move towards the right side, cuz htat's where the current is goin

[Fastal]

Ok, for this first u have to determine the North and South poles of the solenoid. That u have to determine by Lenz's law. Now North always has anticlockwise current right? So u simply draw the arrow for the direction of current. The Ammeter needle will deflect in the direction of the current. Simple. like in the case of ur diagram, it will move towards the right side, cuz htat's where the current is goin

i THINK he/she is right

[Raywin]

HI!!!! need some help here... are my answers right..? or wrong.. hehhs,
help pleaseee


... helllllppp .. dont really know what the MS's talking about...

I think ur right.. wht does the MS tell?

[ambitious94]

Here....

Thanks for this! i was just about to request the answer to it But one thing's bugging me. Why'd they give us the diagram of the house? Aren't those switches that are drawn in the diagram in the question...I'm gettin confused with that