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Magnetic field liness can be entirely co...

Magnetic field liness can be entirely confined within the core of a toroid, but not within a straight solenoid Why ?

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A solenoid by constuction has two magnetic poles at the edges when current is flowing through its widings so flux leaks out from solenoid.
One can think toroid as a solenoid that has been curved and joined, so no poles are open.Hence Magnetic field lines can be entirely confined within the core of a toroid.
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RESONANCE ENGLISH-ELECTRODYNAMICS-Exercise-3 PART-3
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  2. Define magnetic susceptibility of a material. Name two elements, one...

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  3. Magnetic field liness can be entirely confined within the core of a to...

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  4. An electron does not suffer any deflection while passing through a reg...

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  5. Write the expression for the magnetic moment (m) due to a planar squar...

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  6. A long straight wire, of circular cross section (radius =a) carries a ...

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  7. A beam of alpha particles projected along +x- axis , experiences a fo...

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  8. Deduce an expression for the magnetic dipole moment of an electron orb...

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  9. The permeability of magnetic material is 0.9983. Name the type of magn...

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  10. A magnetic needle free to rotate in a vertical plane parallel to the m...

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  11. (a)Using Ampere's circuital law, obtain the expression for the magneti...

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  12. (a) Write the expression for the force, vecF, acting on a charged part...

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  13. What are permanent magnets? Give one example.

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  14. A proton and a deuteron having equal momenta enter in a a region of a ...

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  15. In given diagrams write the direction of magnetic field produced at po...

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  16. Write Biot-Savart law. Write the path of motion of an electron when i...

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  17. A long straight wire of a circular cross section (radius a) carrying s...

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  18. Using the concept of force between two infinitely long parallel curren...

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  19. Show diagrammatically the behaviour of magnetic field lines in the pre...

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  20. If magnetic monpole existed, how would Gauss law of magnetism be modif...

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