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Author Topic: Physics Help HERE ONLY !!  (Read 80919 times)

Offline Shogun

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Re: Physics Help HERE ONLY !!
« Reply #165 on: May 27, 2009, 05:33:20 pm »
ure welcome , glad to help :D
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Offline qwert101

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Re: Physics Help HERE ONLY !!
« Reply #166 on: May 28, 2009, 12:45:51 pm »
anybody know the limits of accuracy your numerical questions should be? like how many significant figures/ decimal places? :-[

thanks
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Offline reishamix

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Re: Physics Help HERE ONLY !!
« Reply #167 on: May 28, 2009, 03:43:22 pm »
in transformers ..

howd u explain

why a secondary output is obtained even though there is no electrical connection between the primary
and secondary coils??

 ::)
« Last Edit: May 28, 2009, 03:53:47 pm by reishamix »
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Offline Shogun

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Re: Physics Help HERE ONLY !!
« Reply #168 on: May 28, 2009, 03:52:51 pm »
Quote from: qwert101 on May 28, 2009, 12:45:51 pm
anybody know the limits of accuracy your numerical questions should be? like how many significant figures/ decimal places? :-[

thanks

hey, all numerical answers must be in 3 significant figures. its easier and foun much acceptable by mark schemes.
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Offline Shogun

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Re: Physics Help HERE ONLY !!
« Reply #169 on: May 28, 2009, 04:00:05 pm »
Quote from: reishamix on May 28, 2009, 03:43:22 pm
in transformers ..

howd u explain

why a secondary output is obtained even though there is no electrical connection between the primary
and secondary coils??

 ::)

this question came in may june 2000 physics paper3, ill explaint it to u in aminute
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Offline Shogun

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Re: Physics Help HERE ONLY !!
« Reply #170 on: May 28, 2009, 04:10:01 pm »
this due to the alternating current, since they keep changing in direction.
the alternating current from the primary coils is cut by the secondary coil ,inducing it with emf. so the secondary coils now have an emf enduced..

any help or confusion u have do ask me..
« Last Edit: May 28, 2009, 04:25:54 pm by Shogun »
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one who masters both the pen and paper is indeed a true warrior.

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Offline crypsAnity

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Re: Physics Help HERE ONLY !!
« Reply #171 on: May 28, 2009, 04:20:06 pm »
^ .. isnt that a lil complicated explanation mates .. think ts simpler ..anyhows heres my version ..

A Secondary Output is obtained because when an ac  Current passes through the Primary Coil .. a constantly
changing magnetic field is produced.. so although the two coils have no wires linking them the magnetic field
produced by the first coil reaches and "cuts" (As its constantly changes its direction for ac current) the secondary coil
therby inducing a current in it .. which is known as "Electromagnetic Induction" .. Faraday uncles theory .. =]
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Offline Shogun

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Re: Physics Help HERE ONLY !!
« Reply #172 on: May 28, 2009, 04:27:08 pm »
or u could with the above guy, but they both have a similar answer.
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Offline crypsAnity

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Re: Physics Help HERE ONLY !!
« Reply #173 on: May 28, 2009, 04:29:24 pm »
@ shogun didnt u say soemthing entirely differnet a minute back man?
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Offline reishamix

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Re: Physics Help HERE ONLY !!
« Reply #174 on: May 28, 2009, 04:29:55 pm »
Quote from: Shogun on May 28, 2009, 04:27:08 pm
or u could with the above guy, but they both have a similar answer.

dude
u jus changed ur answer

"this is due to the iron core u see, very small amount of electrical filed is present in the wires which  induces and emf on the secondary coild due to the iron core."

wht r u doing?
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Offline Shogun

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Re: Physics Help HERE ONLY !!
« Reply #175 on: May 28, 2009, 04:33:31 pm »
yup ,  didnt read the question well,my mistake

i was gonna say to the other guy tht he did not answer to the question where it was said with no electric current, then i reallised wat i wrote was truly freaken complicated, so i thought i better change it b4 u read it and get confused....
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one who masters both the pen and paper is indeed a true warrior.

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Offline reishamix

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Re: Physics Help HERE ONLY !!
« Reply #176 on: May 28, 2009, 04:38:56 pm »
Quote from: Shogun on May 28, 2009, 04:33:31 pm
yup ,  didnt read the question well,my mistake

i was gonna say to the other guy tht he did not answer to the question where it was said with no electric current, then i reallised wat i wrote was truly freaken complicated, so i thought i better change it b4 u read it and get confused....

lol i did get confused
By the way .. cryps is a gurl ..

Thanks tho!!
=]
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Offline crypsAnity

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Re: Physics Help HERE ONLY !!
« Reply #177 on: May 28, 2009, 04:39:40 pm »
hehe.. right and i thought ud lost it? =p .. lol anyhows man.. um off studying physics.. sighs anyoens got butterflies in their stomach?
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Offline Shogun

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Re: Physics Help HERE ONLY !!
« Reply #178 on: May 28, 2009, 04:49:47 pm »
sorry crysp, and lol,i got butterflies and probably some elephants in my stomach
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one who masters both the pen and paper is indeed a true warrior.

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Offline qwert101

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Re: Physics Help HERE ONLY !!
« Reply #179 on: May 28, 2009, 06:47:54 pm »
Quote from: Shogun on May 28, 2009, 03:52:51 pm
Quote from: qwert101 on May 28, 2009, 12:45:51 pm
anybody know the limits of accuracy your numerical questions should be? like how many significant figures/ decimal places? :-[

thanks

hey, all numerical answers must be in 3 significant figures. its easier and foun much acceptable by mark schemes.

thanks :P
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