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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 225608 times)

Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1995 on: May 26, 2010, 03:45:09 pm »
Quote from: A@di on May 26, 2010, 03:44:31 pm
Don't lose more than 5 marks in paper 3. A* surely.
ouch

5 marks max?

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Offline thenewkid™

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1996 on: May 26, 2010, 03:45:46 pm »
Quote from: ang3l on May 26, 2010, 03:39:45 pm
Whats the difference between Electromagnetism and Electro magnetic induction?
thx
electromagnetic induction is the emf induced due to a magnetic field

wheras an electromagnet is a magnet which can be switched on and off
and is made due to the magnetic field of a current
hope this helped
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1997 on: May 26, 2010, 03:47:19 pm »
Quote from: Kimo Jesus on May 26, 2010, 03:45:09 pm
ouch

5 marks max?



Don't lose more than 5 marks ...its good to be on the safer side.
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1998 on: May 26, 2010, 03:47:57 pm »
Quote from: thenewkid™ on May 26, 2010, 03:45:46 pm
electromagnetic induction is the emf induced due to a magnetic field

wheras an electromagnet is a magnet which can be switched on and off
and is made due to the magnetic field of a current
hope this helped

Thx..:D

Another thing...When does the wire/coil watever cuts the magnetic field..When it is vertical or horizontal  ???
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Offline ambitious94

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1999 on: May 26, 2010, 03:48:38 pm »
Quote from: A@di on May 26, 2010, 03:24:03 pm
9B) red-->blue-->green-->yellow

ATTACHED
can u  plz temme y the others r NOT THE ANSWER...I'd really appreciate it. I mean current flows thru all of them doesnt it?
What does a full-wave rectification circuit look like?
THANKS :)
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2000 on: May 26, 2010, 03:48:58 pm »
allright ! will do !

thanks for all ur help

i hope ur heere all day incase i need anything

ima work my but off all night 2day !
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Offline M'i'D'o

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2001 on: May 26, 2010, 03:49:39 pm »
hey everybody there is a question in paper 1 physics i was solving yesterday while studying...
a steel bar is hanged near an electromagnet....
A ( attract  attract )
B ( attract  repel   )
C  ( repel attract )
D ( repel repel )
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2002 on: May 26, 2010, 03:52:18 pm »
Quote from: ambitious94 on May 26, 2010, 03:48:38 pm
can u  plz temme y the others r NOT THE ANSWER...I'd really appreciate it. I mean current flows thru all of them doesnt it?
What does a full-wave rectification circuit look like?
THANKS :)

B and D is black to red. C, the circuit aint complete, it wil never reach the lower terminal.
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2003 on: May 26, 2010, 03:52:38 pm »
Quote from: M'i'D'o on May 26, 2010, 03:49:39 pm
hey everybody there is a question in paper 1 physics i was solving yesterday while studying...
a steel bar is hanged near an electromagnet....
A ( attract  attract )
B ( attract  repel   )
C  ( repel attract )
D ( repel repel )

Paper link please.
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Offline J.Darren

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2004 on: May 26, 2010, 03:52:54 pm »
Quote from: ang3l on May 26, 2010, 03:47:57 pm
Thx..:D

Another thing...When does the wire/coil watever cuts the magnetic field..When it is vertical or horizontal  ???
- When a current carrying wire / coil goes between the magnetic field.
- When a magnet is pushed in / out of the coil.
- When a wire goes across the magnetic field.
- When an electromagnet is placed right next to a solenoid, it only cuts the magnetic field at the instance when it is being switched on and off.
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Offline mdwael

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2005 on: May 26, 2010, 03:53:42 pm »
Quote from: Ivo on May 26, 2010, 03:29:30 pm
Sorry for the rubbish diagram!

You saved my life!  :)
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Offline Adzel

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2006 on: May 26, 2010, 03:55:10 pm »
Quote from: M'i'D'o on May 26, 2010, 03:49:39 pm
hey everybody there is a question in paper 1 physics i was solving yesterday while studying...
a steel bar is hanged near an electromagnet....
A ( attract  attract )
B ( attract  repel   )
C  ( repel attract )
D ( repel repel )

A ( attract  attract )...Im very sure!  ;)
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Offline WARRIOR

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2007 on: May 26, 2010, 03:55:46 pm »
Quote from: ang3l on May 26, 2010, 03:47:57 pm
Thx..:D

Another thing...When does the wire/coil watever cuts the magnetic field..When it is vertical or horizontal  ???

it  depends

it it cuts at both but maximum cutting is whn its horizontall ( whn voltage induceed is max ) ..it exactly stops cutting whn its prefectly VERTICAL ( this is whn teh voltage induced is 0 )


 ( motor affect ) of coil
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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2008 on: May 26, 2010, 03:56:34 pm »
Quote from: Adzel on May 26, 2010, 03:55:10 pm
A ( attract  attract )...Im very sure!  ;)

Beware, it says steel...
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Offline NidZ- Hero

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #2009 on: May 26, 2010, 03:56:50 pm »
an induced current always flow in de direction such that it opppose the change which produced it this de is de law


explanation
if a magnet is moved in or out of a coil a current is induced in de coil lke if de induced current turns the coil into a weak electromagnet whose N pole opposses de approachin N pole of de magnet when de magnet is induced is pulled out of de coil the induced current alters de dirtection and de poles of de coil r reversed then de de tmme de coil attract de magnet as its pulled away. so once again de the change is opppoesd
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