Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Section - B
A tightly wound long solenoid carries a current of 1.5 A. An electron is executing uniform circular motion inside the solenoid with a time period of 75 ns. The number of turns per metre in the solenoid is 
. [Take mass of electron 
, charge of electron 
, 
Text Solution
Verified by ExpertsThe correct answer is:
250
Section - B
(250) Since time period of a revolving charge is 
Where 
magnetic field
due to a solenoid 
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