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 meter in the solenoid is . [Take mass of electron 
, charge of electron 
, 
Text Solution
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(250)
Since time period of a revolving charge is 
Where 
magnetic field
due to a solenoid 
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