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electron emittes with negligible speed from an electron gun and acceleratd through potential difference V along X-axis. these electrons emerge from a narrow hole into a uniform magnetic field B directed along this axis however some of electrons emerging from hole make slightly divergent angles as shown in figure. show that these divergent parraxial electron are refocussed on the X-axis at distance [8 2 mV/ eB 2 ] 1/2


electron emittes with negligible speed from an electron gun and acceleratd through potential difference V along X-axis. these electrons emerge from a narrow hole into a uniform magnetic field B directed along this axis however some of electrons emerging from hole make slightly divergent angles as shown in figure. show that these divergent parraxial electron are refocussed on the X-axis at distance
 
 
[82mV/eB2]1/2


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