Class 12PhysicsMoving Charges and MagnetismAmpere’s circuital law and its application (Solenoid and Toroid)
Easy$A$ toroidal solenoid with air core has an average radius $R$,number of turns $N$,and area of cross-section $A$. The self-inductance of the solenoid is (Neglect the field variation across the cross-section of the toroid).
- A$\frac{\mu_{0} N^{2} A}{R}$
- B$\frac{\mu_{0} N^{2} A}{2 \pi R}$
- C$\frac{\mu_{0} NA}{2 \pi R}$
- D$\frac{\mu_{0} NA}{R}$
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View Solution$A$ long solenoid is fabricated by closely winding a wire of radius $0.5 \, mm$ over a cylindrical frame so that the successive turns nearly touch each other. What is the magnetic field at the centre of the solenoid if it carries a current of $5 \, A$?
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