Try :

This should be enough .

when a charged particle moves in an external UNIFORM magnetic field then it experiences a magnetic force.

 

The magnetic force ( on a charge q moving with velocity in a magnetic field is given both in magnetude and direction, by

= q( x )

 

Particle Motion under O Magntic Field:
(Secondary Information)
= q( + )
If change is projected to the Magnetic Field. The path of the charged particle is purely circular and magnetic force povides necessary centripedal force.


R = Radius of the path.
T = Time period of the path.

Otherwise particle moves in a helical path:
Radius =
Time Period =
Pitch = V₁₁ x T =
where is velocity to magnetic field V₁₁ is velocity 11 to the magnetic field.

 

also : http://en.wikipedia.org/wiki/Magnetic_field

There is only one AIIMS and it is in Delhi .

Location : AIIMS Main Hospital is located at Ansari Nagar, in front of Safdarjung Hospital at the crossing of
    Ring Road and Aurobindo Marg. Main entrance is on Aurobindo Marg.

There aren't any sites on net which offer previous IIT papers for free (if you wanna buy them on net try searching www.google.com  or www.successcds.net )

Also there are many books , like that of "Arihant" (best in my view) which have previous years IIT papers (solved/unsolved).Try consulting your nearby bookstore.

Good Luck ! I'm sure you are working hard.

The question is wrong because all bodies apply only attractive gravitational force so if  the diagram is:

A ------------------ B ------------- C

       8m                        6m             

 

then the net force apllied by A and B at C cannot be equal to zero , because both A & B will pull C toward direction of A . If A is pulling C then B is pushing C only then can force be zero , but that can never happen as both can only pull.

So you must check if you have correctly typed your question.

If C is between A and B

A---------------C--------------B

       2m                     6m

then

Try searching on this

+

goiit's study material .

Good luck !