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Capacitance Parallel Plate Conducting Slab - Capacitor & Capacitance, Physics, Class 12 Video Lecture

FAQs on Capacitance Parallel Plate Conducting Slab - Capacitor & Capacitance, Physics, Class 12 Video Lecture

1. What is capacitance in the context of a parallel plate conducting slab?

Ans. Capacitance refers to the ability of a parallel plate conducting slab to store electrical energy in the form of an electric field. It is a measure of the amount of charge that can be stored per unit voltage across the slab. The capacitance of a parallel plate conducting slab depends on several factors such as the area of the plates, the distance between them, and the dielectric constant of the material between the plates.

2. How does the capacitance of a parallel plate conducting slab change if the area of the plates is increased?

Ans. If the area of the plates of a parallel plate conducting slab is increased, the capacitance also increases. This is because a larger area implies a larger surface for the charges to accumulate, resulting in a higher charge storage capacity. Mathematically, the capacitance of a parallel plate capacitor is directly proportional to the area of the plates.

3. What happens to the capacitance of a parallel plate conducting slab if the distance between the plates is decreased?

Ans. If the distance between the plates of a parallel plate conducting slab is decreased, the capacitance increases. This is because a smaller distance between the plates leads to a stronger electric field, which in turn allows for a higher charge storage capacity. In mathematical terms, the capacitance of a parallel plate capacitor is inversely proportional to the distance between the plates.

4. How does the presence of a dielectric material between the plates affect the capacitance of a parallel plate conducting slab?

Ans. The presence of a dielectric material between the plates of a parallel plate conducting slab increases its capacitance. This is because the dielectric material reduces the electric field between the plates, allowing for a greater charge storage capacity. The capacitance of a parallel plate capacitor with a dielectric material is given by the formula C = εA/d, where ε is the dielectric constant of the material, A is the area of the plates, and d is the distance between the plates.

5. Can the capacitance of a parallel plate conducting slab be negative?

Ans. No, the capacitance of a parallel plate conducting slab cannot be negative. Capacitance is a positive scalar quantity that represents the ability to store electrical energy. It is defined as the ratio of the magnitude of the charge on one plate to the potential difference between the plates. Therefore, the capacitance of a parallel plate capacitor can only have positive values.

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