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r = 3 cm = 3 × 10⁻² m
k = 9 × 10 ⁹ Nm²/C²
E = k . q/r²
E = 9 × 10⁹ . 6 × 10⁻⁶/(3 × 10⁻²)²
E = 54 × 10³/(9 × 10⁻⁴)
E = 6 × 10³⁻⁽⁻⁴⁾ N/C
E = 6 × 10⁷ N/C
Jawaban: A