A velocity selector consists of electric field 
and magnetic field 
with B=12 mT. The value E required for an electron of energy 728 eV moving along the positive x-axis to pass undeflected is: (Given, mass of electron = 9.1 x 10 -31 kg)
Text Solution
Verified by ExpertsThe correct answer is:
A
, 
, Energy = 728 eV
Energy = 
mv 2
E = vB
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