alleryStart learning →A toroidal coil is much like a solenoid bent into a circle. What is the field inside it like?
AVery strong and straight
BVery weak and straight
CVery strong and circular
DVery weak and circular
Answer & Solution
Correct answer: C. Very strong and circular
1. A toroidal coil is much like a solenoid bent round into a circle.
2. The field inside it is very strong but circular rather than straight.
3. Charged particles then travel in circles following those field lines.
4. Since the particles do not cross field lines, they cannot escape the toroid.
5. This is why the toroidal coil is used to confine reactive particles in a tokamak.
_Source: OpenStax College Physics (CC BY 4.0), Ch 22 "Magnetism", section 22.9 Magnetic Fields Produced by Currents: Ampere's Law_
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