Movement of particles in Magnetic Field

[Suy]

Movement of particles in Magnetic Field, Need help!

Homework Statement

http://img132.imageshack.us/img132/9773/81045485.jpg

Homework Equations

The Attempt at a Solution

i need someone to confirm if this is right...
1) B
3)C<B<A
For the first one, my friend said it's A,because it bends more,
i think he is wrong...
If i am wrong, please explain it
ty! (just 1 and 3)

 

[rl.bhat]

Path of the charged particle in a uniform magnetic field is given by
m*v^2/r = qvB
or
m*v = q*r*B.
Now try for the solution.

 

[Suy]

r=(mv)/qB, radius is proportional to the velocity,
B have the largest radius, so the speed will be the fastest

r=(mv)/qB, radius is proportional to the inverse of charge
A have the smallest radius, so the charge will the biggest,...
C<B<A
am i right?

 

[Suy]

anyone... ? I still have 2 more similar question to do, I need some one to confirm if i am right on this one

 

[rl.bhat]

Your answers are correct.
For 2, use Flemming's left hand rule to decide the nature of the charges.

 

[Suy]

thank you so much!