Two point charges of +2 μC each are placed 3 m apart in vacuum. The fo…

Question

Two point charges of +2 μC each are placed 3 m apart in vacuum. The force between them is (k = 9 × 10⁹ N m²/C²)

Accepted Answer

B. {'text': '4 mN', 'label': 'B'}

1. F = k q₁ q₂ / r².
2. Substitute: F = 9 × 10⁹ × (2 × 10⁻⁶)² / 3².
3. = 9 × 10⁹ × 4 × 10⁻¹² / 9 = 4 × 10⁻³ N = 4 mN.
4. So the mutual force is 4 milli-newtons.
_Source: NCERT Class 12 Physics, Ch 1 "Electric Charges and Fields", §1.5_

Answer

{'text': '0.4 mN', 'label': 'A'}

Answer

{'text': '4 N', 'label': 'C'}

Answer

{'text': '40 N', 'label': 'D'}