alleryThe electric field at distance r from an isolated point charge q is
AE = kq / r
BE = kq × r
CE = kq / r²
DE = kq × r²
Answer & Solution
Correct answer: C. E = kq / r²
1. Electric field is force per unit test charge.
2. From Coulomb's law: E = F/q_test = k q / r².
3. Direction is radially outward for positive q, inward for negative.
4. SI unit is N/C or equivalently V/m.
_Source: syllabus Physics, Ch 1 "Electric Charges and Fields", §1.6_
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