Two parallel metal plates A and B separated by a distance 25

Last updated: 6/26/2023

Two parallel metal plates A and B separated by a distance 25 cm are connected to an ammeter Photons of energy 3 28 eV are incident on the photosensitive plate A of threshold wavelength 5000 A The minimum value of the magnetic field to be applied parallel to the plates so that the current through the ammeter becomes zero is Bx10 5 T Then the value of B is mass of electron 9 0x10 31 kg charge of electron 1 6 10 19 C