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Magnetic Field Lines Can Be Entirely Confined Within the Core of a Toroid, but Not Within a Straight Solenoid. Why? - Physics

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

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Solution

Magnetic field lines form closed loops around a current-carrying wire. The geometry of a straight solenoid is such that magnetic field lines cannot loop around circular wires without spilling over to the outside of the solenoid. The geometry of a toroid is such that magnetic field lines can loop around electric wires without spilling over to the outside. Hence, magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid.

Concept: Solenoid and the Toroid - the Toroid
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