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
v=BE
v=B/E
v=E/B
v=B2/E
A
v=B/E
B
v=BE
C
v=E/B
D
v=B2/E
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Solution
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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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