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Magnetic field lines can be entirely con...

Magnetic field lines 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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A: Magnetic field lines can be entirely confined within the corre of a toroid. R: Magnetic field lines cannot be entirely confined within the corer of a straight sotenoid.

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Which of the following statements are correct? (A) Electric monopoles do not exist whereas magnetic monopoles exist. (B) Magnetic field lines due to solenoid at its ends and outside cannot be completely straight and confined. (C) Magnetic field lines are completely confined within a toroid. (D) Magnetic field lines inside a bar magnet are not paralle. (E) x=-1 is the condition for a perfect diamagnetic material, where x is its magnetic susceptiblity. Choose the correct answer from the option given below:

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