A condenser has a capacity 2 μF and is charged to a voltage of 50 V. The energy stored is

Options

(a) 25×10⁵ joule
(b) 25 joule
(c) 25×10 erg
(d) 25×10³ erg

Correct Answer:

25×10³ erg

Explanation:

Energy = (1/2) CV² = (1/2) × (2 × 10⁻⁶) × (50)²

= (2 × 10⁻⁶ × 2500) / 2 = 2500 × 10⁻⁶ J

Energy = 2500 × 10⁻⁶ × 10⁷ = 25 × 10³ erg