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Conductivity is described as arising from charge carriers that are:

AModest
BModular
CMomentary
DMobile
Answer & Solution
Correct answer: D. Mobile
1. A material conducts only if charge within it can move. 2. Fixed charges cannot carry a current. 3. Conductivity arises from mobile charge carriers. 4. So the answer is mobile. _Source: syllabus Physics, Ch 3 'Current Electricity'_
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