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Electric field E at a point due to a point charge q at distance r is:
AE = k q / r
BE = k q / r²
CE = k q² / r²
DE = k q² / r
Answer & Solution
Correct answer: B. E = k q / r²
1. E = F / q_test = k q / r², independent of the test charge.
2. Direction: radially outward from positive q (inward for negative).
3. SI unit: N C⁻¹ = V m⁻¹.
_Source: NCERT Class 12 Physics Ch 1 §1.6 Electric Field_
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