In an experiment on photoelectric effect, the separation between emitter and the collector plates is
10cm. Plates are connected through an ammeter without any cell. A magnetic field B exists parallel to the plates. The work function of the emitter is
2.39eV and the light of wavelengths between
400nm and
600nm is incident on it. If minimum value of
B for which the current registered by the ammeter is zero is
n×10−6T. Then find out value of
n (Neglect any effect of space charge). (assume emission of photo electron to be radomly every possible direction)
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