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For an ideal toroid the field outside the core (open interior region of interest in exams) is taken as zero.
Hence the keyed answer is zero.
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It marks the longest night of the year (in that hemisphere).
So the correct answer is longest night.
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A complete primary dentition has 20 teeth.
So the correct answer is 20.
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According to the keyed exam answer, waterproofing relates to surface tension.
Editor note: modern waterproofing is broader than surface tension alone; options left unchanged.
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It measures solid angle.
Hence the keyed answer is Solid angle.
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Aerodynamics studies forces on objects in air flow.
So the correct answer is Aerodynamics.
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