A long solenoid has 70 turns 
and carries current 
. An electron moves within the solenoid in a circle of radius 
perpendicular to the solenoid axis. If the speed of the electron is 
then the current 
in the solenoid is(Take 
SI unit, mass of electron 
, charge of electron 
)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
We have 
So, most appropriate option is .
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