Capacitor is an arrangement of two conductors carrying charges of equal magnitude and opposite sign and separated by an insulating medium.
(i) The net charge on the capacitor as a whole is zero. When we say that acapacitor has a charge Q, we mean that positively charged conductor has a charge +Q and the negatively charged conductor has a charge -Q.
(ii) The positively charged conductor is at a higher potential than negatively charged conductor. The potential difference V between the conductors is proportional to the magnitude of charge Q and the ratio Q/V is known as capacitance C of the capacitor.
(iii) Unit of capacitance is farad (F). The capacitance is usually measured in microfarad (μF)
Q1 In which form is energy stored in a charged capacitor?
- Mechanical energy
- Kinetic energy
- Electrical energy
- none of these
- Electrical energy
Q2 Capacitance of a parallel plate capacitor depends upon
- Surface area of plates
- distance between plates
- potential
- both (a) and (b)
- both (a) and (b)
Q3 Capacitance is the ratio of
- `\frac{Q}{V^{2}}`
- `\frac{Q^{2}}{V}`
- `\frac{V^{2}}{Q}`
- `\frac{Q}{V}`
- `\frac{Q}{V}`
Q4 What happens to the capacitance of a capacitor when dielectric slab is placed inside it?
- decreases
- increases
- remains same
- none of these
- increases
Q5 Capacity of spherical conductor depends upon
- Area
- Volume
- Radius
- Both (a) and (b)
- Radius
Q6 The SI unit of capacitance is
- Farad
- volt
- Ampere
- all of these
- Farad
Q7 Capacitance is a vector quantity.
- True
- False
False
Q8 Capacitor is used to store......
- Neutron
- Charge
- Current
- None of these
- Charge
Q9 Total parallel capacitance is less than that of the smallest capacitor in parallel.(True/ False)
- True
- False
- False
Q10 N capacitors having capacitance C are connected in series, calculate the equivalent capacitance
- C/N
- CN
- N/C
- None of these
- C/N
