JEE Main 2025 Physics question
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 75ns. The number of turns per metre in the solenoid is. [Take mass of electron kg, charge of electron C, , 1 ns = s]
Answer: 250
Solution
. Solving with given values gives n = 250.