A directed stream of electrons flies out of a thin long slit with a speed v = 105 m/s (Fig. 9.13). Electron concentration in the flow n=1010 particles/m3. At what distance from the slit did the beam thickness double? Electron mass m=9•10-31 kg, electron charge e=1.6•10-19 C, electric constant e0=8.85•10-12 F/m.
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