Capacitors

In a charged capacitor, the energy resides

• The positive charges

• Both the positive and negative charges

• The field between the plates

• Around the edge of the capacitor plates

The energy of a charged capacitor is given by the expression (q= charge on the conductor and C = its capacity)

• $\frac{q^2}{2C}$

• $\frac{q^2}{C}$

• $\frac{q^{ }}{2C^2}$

• 2qC

The capacity of parallel plate condenser depends on

• The type of metal used

• The thickness of plates

• The potential applied across the plates

• The separation between the plates

The capacity of a parallel plate condenser is C . Its capacity when the separation between the plates is halved will be

• 4C

• 2C

• C/2

• C/4

Can a metal be used as a medium for dielectric

• Depends on its shape

• Depends on dielectric

• YES

• NO

When a slab of dielectric material is introduced between the parallel plates of a capacitor which remains connected to a battery, then charge on plates relative to earlier charge

• Is less

• Is same

• Is more

• May be less or more depending on the nature of the material introduced

125 identical drops each charged to the same potential of 50 Volts are combined to form a single drop. The potential of the new drop will be

• 50 V

• 250 V

• 500 V

• 1250 V

Two condensers of capacity 0.3  $\mu$  F and 0.6  $\mu$  F respectively are connected in series. The combination is connected across a potential of 6 Volts. The ratio of energies stored by the condensers will be

• 1/2

• 2

• 1/4

• 4

Three equal capacitors, each with capacitance are connected as shown in figure. Then the equivalent capacitance between and is

• C

• C/3

• 3C

• 3C/2

Change Q on a capacitor varies with voltage V . The area of triangle OAB represents

• Capacitance

• Capacitive reactance

• Magnetic field between the plates

• Energy stored in the capacitor