Capacitors

Step 1: Formula for energy stored in a capacitor.
The energy ( ) stored in a capacitor is given by the formula: where: - is the capacitance in farads (F), - is the voltage in volts (V). Step 2: Given values.
- , - . Substituting these values into the formula: Step 3: Conclusion.
Thus, the energy stored in the capacitor is 0.5 joules.

Step 1: Parallel combination of capacitors.
In a parallel combination of capacitors, the potential difference across each capacitor remains the same. This is a fundamental property of parallel circuits: each component shares the same voltage.
Step 2: Explanation of each option.
- (A) Charge: Incorrect. The charge on each capacitor is different in a parallel combination.
- (B) Energy: Incorrect. The energy stored in each capacitor will differ based on their capacitance.
- (C) Potential difference: Correct. The potential difference is the same for all capacitors in a parallel combination.
- (D) Capacity: Incorrect. The capacitance of each capacitor in the parallel combination may differ, but the potential difference is the same.
Step 3: Conclusion.
In a parallel combination of capacitors, the potential difference remains the same for each condenser.