Electrical Charges and Fields — Flashcards

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1. There are two types: positive and negative. 2. Like charges repel; unlike charges attract. 3. Charge is conserved: total charge in an isolated system remains constant. 4. Charge is quantised: it ex…

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Electrons are transferred from glass to silk. The glass rod loses electrons and becomes positively charged. The silk gains electrons and becomes negatively charged. This is due to friction, and the pr…

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By conservation of charge, the silk gains equal and opposite charge. Given: q_glass = +3.2 × 10⁻¹⁷ C Therefore, q_silk = -3.2 × 10⁻¹⁷ C. Answer: -3.2 × 10⁻¹⁷ C…

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Formula: Q = ne ⇒ n = Q/e Given: Q = 1 C, e = 1.6 × 10⁻¹⁹ C n = 1 / (1.6 × 10⁻¹⁹) = 6.25 × 10¹⁸ electrons. Answer: 6.25 × 10¹⁸ electrons…

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No. Charge is quantised in integer multiples of e (1.6 × 10⁻¹⁹ C). Since 2.5 is not an integer, 2.5e is not allowed. Only charges like 1e, 2e, 3e are possible.

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The electrostatic force between two point charges is directly proportional to the product of their magnitudes and inversely proportional to the square of the distance between them. Formula: F = k(q₁q₂…

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Given: q₁ = q₂ = 6.0 × 10⁻¹⁰ C, r = 2.0 m, k = 9 × 10⁹ Nm²/C² F = k(q₁q₂)/r² = (9 × 10⁹) × (6.0 × 10⁻¹⁰)² / (2.0)² = (9 × 10⁹) × (3.6 × 10⁻¹⁹) / 4 = (3.24 × 10⁻⁹) / 4 = 8.1 × 10⁻¹⁰ N Answer: 8.1 × 10⁻…

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Given: q₁ = 16 × 10⁻⁶ C, q₂ = 9 × 10⁻⁶ C, r = 12 m, k = 9 × 10⁹ F = k(q₁q₂)/r² = (9 × 10⁹) × (16 × 10⁻⁶) × (9 × 10⁻⁶) / (12)² = (9 × 10⁹) × (1.44 × 10⁻¹⁰) / 144 = (1.296 × 10⁰) / 144 = 0.009 N Force o…