MHT CET 2022 Physics question
A long solenoid has 200 turns per cm and carried a current i. The magnetic field at its center is . Another long solenoid has 100 turns per cm and it carries a current . The value of magnetic field at its center is nearly
Answer: (C)
Solution
The field inside a long solenoid is , so . For the second solenoid the turns per unit length are halved ( vs per cm) and the current is one-third: . Therefore $ =
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