A) 2 : 1
B) 1 : 2
C) 4 : 1
D) 1 : 4
Correct Answer: B
Solution :
[b] Since, magnetic field is acting at right angles to the direction of motion of electron beams, so their paths will be circular. \[r=\frac{mv}{qB}\] or \[r\propto v\,\,\] \[\therefore \,\,\,\frac{{{r}_{1}}}{{{r}_{2}}}=\frac{{{v}_{1}}}{{{v}_{2}}}=1/2\] or \[{{r}_{1}}:{{r}_{2}}=1:2\]
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