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I need help in Physics

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lazy-sleeper

IF-Rockerz

lazy-sleeper

Joined: 30 April 2011

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Posted: 15 July 2012 at 4:01pm | IP Logged
1. I am unable to decide how to find direction in case of Right hand thumb rule in magnetic induction/force/field. There are other rules too i know but our sir told to follow only the right hand rule so bit confused.
2. I am confused where to apply the wheatstone bridge principle and where not to? Totally confused about current distribution.
3.I dont get head or tail of rotational kinematics.
P.S: It would be of much help if anyone would like to and come forward to guide me in the above parts of physics.

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lazy-sleeper

IF-Rockerz

lazy-sleeper

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Posted: 15 July 2012 at 4:03pm | IP Logged
Thank you
Ananya
(I am ol through my cell and it allows only 512 characters so pls dont mind if i make multiple replies)

Freethinker112

IF-Sizzlerz

Freethinker112

Joined: 16 May 2012

Posts: 13810

Posted: 30 July 2012 at 3:26am | IP Logged
Did you get your answer? Otherwise, i might help.

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lazy-sleeper

lazy-sleeper

IF-Rockerz

lazy-sleeper

Joined: 30 April 2011

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Posted: 30 July 2012 at 4:54am | IP Logged
Originally posted by Freethinker112

Did you get your answer? Otherwise, i might help.

Yes if you can help please do:D

Freethinker112

IF-Sizzlerz

Freethinker112

Joined: 16 May 2012

Posts: 13810

Posted: 30 July 2012 at 9:16am | IP Logged
Originally posted by Miss.Mars

1. I am unable to decide how to find direction in case of Right hand thumb rule in magnetic induction/force/field. There are other rules too i know but our sir told to follow only the right hand rule so bit confused.

Right hand thumb rule basically says that when you curl fingers of your right hand and keep thumb up, then if your thumb is pointing in the direction of current, then the direction of your finger shows the direction of magnetic field. Like this,
You see, thumbs point up i.e. the direction of current, so direction of magnetic field is the direction of fingers i.e. anti clockwise.

There is another cool application of your right hand. You must have read cross product of vectors. E.g. - Force on a moving conductor in magnetic field is given by F=IL X B. Now, to know the direction of F, you can use the right hand rule. First stretch your right palm with the fingers pointing towards the direction of first vector, in this case I. Then curl your fingers towards the direction of second vector, in this case B. Then the direction of thumb will give you the direction of the resultant vector, in this case F. Remember, you may have to bend your hand in awkward positions to be able to curl from first vector to second, but it will always give correct result. Try it!



Originally posted by Miss.Mars

 2. I am confused where to apply the wheatstone bridge principle and where not to? Totally confused about current distribution.

Wheatstone consists of four resistances. A pair of resistances is created by joining two in series. And now both series are connected in parallel. And then the mid point of the two series, where the two resistances of the series meet, are joined. This mid wire should not get any current when Wheatstone is balanced.  E.g. you have four Resistance R1, R2, R3, R4. You connect R1, R2 in series and then R3,R4 in series. Now you connect both series in parallel. And the mid point i.e. where R1, R2 met and where R3, R4 met is joined and should not get any current.

The formula you get is R1/R3=R2/R4. If the arrangement of resistances is like Wheatstone and you know the value of all the resistances, apply the formula above. If it is true, then it is a Wheatstone and no current will pass through the mid wire. If you are told to find the value of unknown resistance, put the value of rest 3 and calculate the 4th.



Originally posted by Miss.Mars

 3.I dont get head or tail of rotational kinematics.

I am sorry but it is not possible to explain the whole rotational kinematics here. Wink


Edited by Freethinker112 - 30 July 2012 at 9:19am

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lazy-sleeperSamraat_92

lazy-sleeper

IF-Rockerz

lazy-sleeper

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Posted: 30 July 2012 at 10:30am | IP Logged
Thanks a lot
This helped much!
Was wondering if you could like guide me on daily basis regarding Rotational kinematics
Anyways your wish
Thanks a lot dear

Freethinker112

IF-Sizzlerz

Freethinker112

Joined: 16 May 2012

Posts: 13810

Posted: 30 July 2012 at 7:25pm | IP Logged
I am sorry but I am very busy nowadays because I have dropped this year and am preparing for IIT again. Unhappy But you can ask short questions like these and if I know the answer, I will post it.

Edited by Freethinker112 - 30 July 2012 at 7:27pm

The following 2 member(s) liked the above post:

lazy-sleeperSamraat_92

lazy-sleeper

IF-Rockerz

lazy-sleeper

Joined: 30 April 2011

Posts: 9017

Posted: 30 July 2012 at 8:36pm | IP Logged
Okay if i face any problem regarding these chapters i will post it here:D
All the best!
i am preparing for NEET this year
otherwise i will drop n go for next year:D

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