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Question

In J.J.Thomson's method , electric field E, magnetic field B and velocity v of the electrons were in mutually perpendicular direction. This velocity selector allows particles of velocity v to pass undeflected when
  1. v=BE
  2. v=B/E
  3. v=E/B
  4. v=B2/E

A
v=B/E
B
v=BE
C
v=E/B
D
v=B2/E
Solution
Verified by Toppr

ElectricForce=Ee
magneticForce=Bve
If both of them act in opposite directions, they may cancel each other in magnitude
Ee=Bve
v=EB

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