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  1. Photons with energy 5eV are incident on a cathode C in a photoelectric cell.
  2. A magnet of length 10 cm and magnetic moment 1 A-m² is placed
  3. A satellite of mass m revolves around the earth of radius R at a height x from
  4. The total kinetic energy of a body of mass 10 kg and radius 0.5 m moving with a velocity
  5. Two charged spheres seperated at a distance d exert a force F on each other.