Question

77. 2072 Set E Q.No. 106 A beam of electrons, moving with velocity of 10 m/s, enters midway between two horizontal parallel plates in the direction parallel to the plates which are 5 cm long and 2 cm apart and have a p.d. of V volts between them. Calculate V if the beam is deflected so that it just grazes the edge of the plate. (Assume e/m = 1.76 x 1011 c/kg). [4] Ans: 90.9 V
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