00:02
This problem covers the concept of right -hand rule.
00:06
And for part a, the direction of the magnetic field in the region is into the page.
00:11
So we mark with a cross -sign.
00:14
So this is the direction of magnetic field.
00:20
Now a proton, which is positive recharge, e -plus, is moving towards the right direction with a velocity, let's say v.
00:30
Then from right hand rule the force exert on the positive charge will be perpendicular to the both velocity and the magnetic field and if we stretch our finger along the if we stretch our thumb along the direction of velocity and point of finger along the direction of magnetic field then the palm gives the direction of magnetic field so the magnetic field force on the proton will be along upward direction.
01:16
So we can write right hand room.
01:32
Switch your right hand.
01:43
Point the thumb along the direction of motion, motion of charge and fingers along the direction of magnetic field.
02:14
Then the then the face then the direction of the palm then the direction of the palm gives the direction of magnetic force on the positive charge and for negative charge a positive direction of the palm is the force direction therefore on the proton moving towards the right the direction of magnetic force will be upward now part b this part the magnetic field is pointing out of the page so we define the pointing out of the page as a dot so this is the magnetic field in the region now a proton is moving towards the right direction so this is the proton which is moving towards the right direction then using the right hand rule the force on the proton will be towards the bottom of the page...