alleryStart learning →Amplifiers in microwave ovens use a magnetic field for which purpose?
ATo heat the metal oven walls
BTo hold the oven door closed
CTo measure the food temperature
DTo contain oscillating electrons
Answer & Solution
Correct answer: D. To contain oscillating electrons
1. Magnetic fields are widely used to contain charged particles.
2. In a microwave oven the amplifier uses a magnetic field to contain oscillating electrons.
3. Those oscillating electrons generate the microwaves that are sent into the oven.
4. Heating the walls or holding the door would need no magnetic containment of charges at all.
_Source: OpenStax College Physics (CC BY 4.0), Ch 22 "Magnetism", section 22.5 Force on a Moving Charge in a Magnetic Field: Examples and Applications_
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