A charge 
is accelerated through a potential difference 
. It is then passed normally through a uniform magnetic field, where it moves in a circle of radius 
. The potential difference required to move it in a circle of radius 
is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
If 
is the velocity acquired by the charge when accelerated through the potential difference 
, then
When it passes normally through a uniform magnetic field 
, it moves in the circle of radius 
.
or 
or 
…… (i)
Let 
be the required potential difference in order to move it in the circle of 
.
From eqn. (i),
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