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(b) Magnetic field lines can be entirely...

(b) Magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid. Why ?

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(b) If we assume magnetic field lines of a straight solenoid to be confined within the solenoid then `oint overset(to) (B) . overset(to)(d) a ne 0` for a closed surface around its two ends which is against Gauss.s law for magnetism. Hence, magnetic field lines of a solenoid cannot be confined within itself.
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KUMAR PRAKASHAN-MAGNETISM AND MATTER-SECTION B Numericals (Numerical From Textual Illustrations)
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  2. A short bar magnet placed with its axis at 30° with an external field ...

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  3. (a) What happens if a bar magnet is cut into two pieces: (i) transvers...

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  4. (b) A magnetised needle in a uniform magnetic field experiences a torq...

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  5. (c) Must every magnetic configuration have a north pole and a south po...

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  6. (d) Two identical looking iron bars A and B are given, one of which is...

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  7. What is the magnitude of the equatorial and axial fields due to a bar ...

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  8. Figure shows a small magnetised needle P placed at a point 0. The arro...

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  9. Many of the diagrams given in Fig 5.7 show magnetic field lines (thick...

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  10. (a) Magnetic field lines show the direction (at every point) along whi...

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  11. (b) Magnetic field lines can be entirely confined within the core of a...

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  12. (c) If magnetic monopoles existed, how would the Gauss's law of magnet...

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  13. Does a bar magnet exert a torque on itself due to its own field '? Doe...

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  14. Magnetic field arises due to charges in motion. Can a system have magn...

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  15. The earth magnetic field at the equator is approximately 04.G. Estimat...

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  16. In the magnetic meridian of a certain place, the horizontal component ...

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  17. A solenoid has a core of a material with relative permeability 400. Th...

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  18. A domain in ferromagnetic iron is in the form of a cube of side length...

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