Why is the magnetic field at a point just outside a current carrying solenoid zero?
Автор: MAGNUS JEE PHYSICS
Загружено: 2020-08-19
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Описание: Chapter : Magnetic Effect of Current & Biot-Savart's Law:: Why is the magnetic field at a point just outside the curved surface of a current carrying solenoid zero? All of the magnetic flux lines due to a solenoid form a closed loop . These filed lines or flux outside the solenoid spread over larger space, actually up to infinity.Hence, the magnetic flux density per unit area of cross-section of the space outside the solenoid is much smaller than that of inside the solenoid. The magnetic field or magnetic flux density at a point just outside the solenoid is given by Bo= (φ/ Ao) where φ is the magnetic flux outside the solenoid and Ao is the area of the space outside the solenoid. Again, the magnetic field or magnetic flux density at a point inside the solenoid is Bi = ( φ/ Ai) where Ai is the area of the space inside the solenoid. Now, the area outside the solenoid is very large. Ao is much greater than Ai ; Hence , Bo ≃ 0 ......
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