alleryThe width of an elementary vertical strip is written as:
Adf
Bdx
Cdy
DdA
Answer & Solution
Correct answer: B. dx
1. The strip is vertical, so it is thin along x.
2. An infinitesimal step along x is written dx.
3. So the width is dx.
4. The answer is dx.
_Source: syllabus Mathematics, Ch 8 'Application of Integrals'_
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