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Radiation of wavelength 4500 overset (@)...

Radiation of wavelength `4500 overset (@)(A)` is incident on a metal having work function 2.0 eV. Due to the presence of a magnetic field B,the most energetic photoelectrons emitted in a direction perpendicular to the field move along a circular path of radius 20 cm. What is the value of the magnetic field B?

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