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The velocity of certain ions that pass undeflected through crossed electric field E=7.7 k V / m and magnetic field B=0.14 ~T is

Options

  1. A18 ~km / s
  2. B77 ~km / s
  3. C55 ~km / s
  4. D1078 ~km / s

Correct answer

C. 55 ~km / s

Step-by-step solution

As velocity v= E B = 7.7 10^3 0.14 =55 ~km / s

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