question_answer 18)

    The electric field intensity produced by the radiations coming from 100 W bulb at a 3 m distance is E. The electric field intensity produced by the radiations coming from 50 W bulb at the same distance is (a)E/2                                    (b)2E (c)                               (d)         

Answer:

  (a)Electric field intensity on a surface due to incident radiation is,            (for the given area of the surface)                 Hence,