Electrons (e,m) emitted with negligible speed from an electron gun are accelerated through a potential difference V0 along the x-axis. These electrons emerge from a narrow hole into a uniform magnetic field of strength B directed along x-axis. Some electrons emerging at slightly divergent angles as shown. These electrons are refocused on the x -axis for second time at a distance √Nπ2mV0eB2. Find the value of N ___.

Electrons (e,m) emitted with negligible speed from an electron gun are

1.	Electrons (e,m) emitted with negligible speed from an electron gun are accelerated through a potential difference V0 along the x-axis. These electrons emerge from a narrow hole into a uniform magnetic field of strength B directed along x-axis. Some electrons emerging at slightly divergent angles as shown. These electrons are refocused on the x -axis for second time at a distance √Nπ2mV0eB2. Find the value of N ___.
Answer» Electrons $(e, m)$ emitted with negligible speed from an electron gun are accelerated through a potential difference $V_{0}$ along the $x-$ axis. These electrons emerge from a narrow hole into a uniform magnetic field of strength $B$ directed along $x-$ axis. Some electrons emerging at slightly divergent angles as shown. These electrons are refocused on the $x -$ axis for second time at a distance $\sqrt{\frac{N π^{2} m V_{0}}{e B^{2}}}$ . Find the value of $N$ ___.