Question

A 10 mF capacitor is charged by a battery of emf 100 volt. The energy drawn from the battery and the energy stored in the capacitor are respectively-

• A. 0.10 J and 0.05 J
• B. 0.05 J and 0.025 J
• C. 1.0 mJ and 0.5 Mj
• D. 0.05 mJ and 0.05 mJ

Answer 1

Answer: (A)

0.10 J and 0.05 J

Answer 2

W_battery = qV = CV² = 10 × 10^–6 × (100)² = 0.1J

U_capacitor = $\frac { 1 } { 2 }$qV = $\frac { 0.1 } { 2 }$ = 0.05 J