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ALL PHYSICS DOUBTS - POST HERE !!
jellybeans:
--- Quote from: ambitious94 on May 25, 2010, 02:09:57 pm ---I have a new question XD
What are nucleons? Neutrons or all the particles present in the nucleus?
Also
The north pole of a bar magnet is placed next to end P of an iron bar PQ, as shown. As a result,
magnetic poles are induced in the iron bar.
S (magnet) N iron bar-->P Q
What are the magnetic poles induced at P and at Q?
magnetic pole at P magnetic pole at Q
A north north
B north south
C south north
D south south
Answer's C. I dont get it...I thght the N pole induced an N pole....:S
--- End quote ---
nope!! when induction occurs , the N pole will induce a S pole on the iron barrrr cuz during induction, the magnet's repelling its same charge to the other side, leaving the surface nearest to N with the 'opposite charge' so P will be south. :)
holtadit:
--- Quote from: rhea on May 25, 2010, 02:12:07 pm ---actually i got a doubt related to this..
i always thought to induce magnetism, you have to stroke a magnet with the magnetic material.
--- End quote ---
See if this helps.
OR read it here if the image's too small :
http://www.le.ac.uk/se/centres/sci/selfstudy/mam9.htm
Raywin:
--- Quote from: 8T on May 25, 2010, 02:08:44 pm ---Raywin ..I didnt.. More explanation please.
--- End quote ---
Hmm.. see there is a complete circuit between the battery and voltmeter 1 meaning that current will flow from the battery through the voltmeter and then to the battery again. This happens even WHEN THE SWITCH IS OPEN. So, voltmeter 1 will NOT show zero. Now, the capacitor will charge up when the circuit was initially closed and when the switched is opened it will discharge, meaning that current will flow from the capacitor through the voltmeter3 and then to the capacitor again. This makes the voltmeter show a reading. Therefore it WILL NOT SHOW ZERO. Thus voltmeter 2 is the only one tht does show zero. :) Now?
Burhan.arshad:
--- Quote from: rhea on May 25, 2010, 02:12:07 pm ---actually i got a doubt related to this..
i always thought to induce magnetism, you have to stroke a magnet with the magnetic material.
--- End quote ---
north pole induce north pole when you hit ot touch it with megnt......but when u just place it near it will induce opposite pole
Vin:
--- Quote from: misterioso on May 25, 2010, 01:58:33 pm ---Can someone explain to me how the answer is B. I understand it has something to do with the capacitor, but why is it that voltmeter two is zero at all? Wouldnt none of them have become zero? Can anyone explain how the capaciter is working in this circuit???
I apologise for the crude picture
--- End quote ---
pics cool ;) i use w7 too ;)
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