A beam of cathode rays is subjected to crossed electric (E) and magnetic fields
A
B
. The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by (Where V is the potential difference between cathode and anode) 
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
When a beam of cathode rays (or electrons) are subjected to crossed electric (E) and magnetic fields, the beam is not deflected, if
Force on electron to magnetic field 
Force on electron due to electric field
or 
(i)
If 
is the potential difference between the anode and the cathode, then
(ii)
Substituting the value of 
from equation (i) in equation (ii), we get
Specific charge of the cathode rays 
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