00:01
Hi students, here in this question we have a proton which is moving towards west.
00:05
So, this is north, south, east and west, geographical directions of the earth.
00:12
So, when we go on to coordinate system, the west is representing minus x axis, isn't it? and the magnetic field is towards downward.
00:27
So, downward if the proton is moving to the west, downward direction is south.
00:32
So, the direction of magnetic field towards minus z axis.
00:38
So, we can write the magnetic field as minus az cap and velocity, velocity is through minus x axis, so minus ax cap.
01:00
Okay, now we have to find out the magnitude of the magnetic force.
01:10
So, we know that f is equal to q v cross.
01:16
So, q is, here it is proton, so q is 1 .6 into 10 raised to minus 19 coulomb into 6 .20 into 10 raised to 6 minus ax cap into 50 into 10 raised to minus 6, that is az cap.
01:47
So, 1 .6 into 10 raised to minus 19, we know that minus ax cap cross minus az cap, minus ax cap cross minus az cap is nothing but minus ay cap, isn't it? minus ay, so minus ay cap.
02:21
So, 6 .20 into 10 raised to 6 into 50 into 10 raised to minus 6 into minus ay cap.
02:34
So, that's equal to 496 into 10 raised to minus 19 newton and towards minus ay cap...