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ALL PHYSICS DOUBTS - POST HERE !!

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igext:
Interesting Question:
In a transformer the induced current in the 2ndry coil also has a mgnetic field right?
then why isnt the current in the primary coil affected?

rhea:

--- Quote from: Raywin on May 25, 2010, 03:28:12 pm ---Its an instrument that is used to measure (accurately) the thickness of something REALLY small like a coin which for example a ruler cannot measure accurately. 

--- End quote ---
to what dp does it measure?
also can it be used to measure a pipe?

Adzel:
@ VIN: the resistance is always directly proportional to the P.D...

Ghost Of Highbury:

--- Quote from: ~VIN1094~ on May 25, 2010, 03:30:29 pm ---Aadi two ques for you .. either im too dumb or the ms is wrong ..

for the first one .. i know its not in the 2010 syllabus i jus wanna know..

fo the 2nd .. i knoe tht the resistance increases in dark but y does pd increase ??..i ve been trying to figure out since long now!

--- End quote ---

for the first one : what is the answer , is it B?

for the second, V = I*R

R increases, V increases

thats wat i can think of now.

Vin:

--- Quote from: igext on May 25, 2010, 03:31:22 pm ---Interesting Question:
In a transformer the induced current in the 2ndry coil also has a mgnetic field right?
then why isnt the current in the primary coil affected?

--- End quote ---

Induced current is produced when the mag. field from the Primary coils 'cuts' the secondary.
When the current is switched off in the primary the mag field dies away therefore cutting secondary as they collapse inducing a pd into it. tht is why a.c is used

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