Question

2)The figure shows two situations when
an electron when an electron with
velocity v travels through a uniform
magnetic field B. In each case what is
the direction of magnetic force on the
electron?
B
B
2
+ ve Z-axis & + ve Y-axis
- ve Z axis & zero
+ ve Z axis & zero
O -ve Z axis​

Answer 1

According to Fleming's left hand rule, in figures (1) and (2)

magnetic force on the electron will be directed in -ve z-axis

and-vex-axis respectively. In figure (3) velocity of electron

and direction of magnetic field are antiparallel, so no force

will act on electron.