alleryDipole fields are worked out most simply at distances that are:
AMuch smaller
BExactly equal
CExactly zero
DMuch larger
Answer & Solution
Correct answer: D. Much larger
1. Close in, the two charges must be handled separately.
2. Far away, the pair acts as a single object.
3. So the simple treatment holds at distances much larger than 2a.
_Source: syllabus Physics Part I, Chapter 1, Electric Charges and Fields._
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