alleryStart learning →What is given as the practical drawback of magnetohydrodynamic drives as they exist today?
AThey are heavy and inefficient
BThey are noisy and expensive
CThey are fragile and leaky
DThey are slow and unreliable
Answer & Solution
Correct answer: A. They are heavy and inefficient
1. A magnetic drive would run more quietly than a propeller, which is why it was proposed for submarines.
2. Existing drives of this kind are heavy and inefficient, and much development work is still needed.
3. Quietness is the attraction, so calling them noisy inverts the very reason they were proposed.
4. Weight and efficiency, not leaks, are what hold the design back.
_Source: OpenStax College Physics (CC BY 4.0), Ch 22 "Magnetism", section 22.7 Magnetic Force on a Current-Carrying Conductor_
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