An electron is moving in a circle of radius 
in a uniform magnetic field 
. Suddenly the field is reduced to 
. The radius of the circular path now becomes
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
As the electron is moving in the circle of radius 
in the uniform magnetic field 
,
or 
where 
and 
is the mass and velocity of the electron respectively.
When the field reduces to 
, the radius of circular path becomes
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