A toroid is a solenoid-like coil bent into a circle, as in the figure first. Tor

Question

A toroid is a solenoid-like coil bent into a circle, as in the figure first. Toroids are the configuration of choice in magnetic-confinement nuclear fusion experiments, which, if successful, could provide us with an almost unlimited energy source using deuterium fuel extracted from seawater. The ITER consortium, an international collaboration, is building a large toroidal fusion experiment in France; it's expected to be the first fusion device to produce energy on a large scale. The second figure shows a cross section of a toroid, with current emerging from the page at the inner edge and descending at the outer edge. The black circle is an Amperian loop. The magnetic field associated with the toroid is nonzero everywhere. only within the region bounded by the coils. only outside the coils. only within the "hole" in the donut-shaped coil. In the second figure, the magnetic field lines must be O circular. straight, and pointing into the figure. straight, and pointing out of the figure. straight, and pointing radially.

Explanation / Answer

a) only in the region within the coil

b) circular

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