When a surface is irradiated with light of wavelength `4950 Å`, a photocurrent appears which vanishes if a retarding potential greater than 0.6 volt is applied across the phototube. When a second source of light is used, it is found that the critical potential is changed to 1.1 volt.
if the photoelectrons (after emission form the source) are subjected to a magnetic field of 10 tesla, the two retarding potentials would

Options

A. Uniformly increase
B. Uniformly decrease
C. remain the same
D. none of these

Answer

C

Explanation

Magnetic field cannot change the kinetic energy of
charged particle.