Electric potential and capacitors-DPP6

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

1000 small water drops each of radius r and charge coalesce together to form one spherical drop. The potential of the big drop is larger than that of the smaller drop by a factor of

• 1000

• 100

• 10

• 1

The distance between the plates of a parallel plate condenser is 4mm and potential difference is 60volts. If the distance between the plates is increased to 12mm , then

• The potential difference of the condenser will become 180volts

• The P.D. will become 20volts

• The P.D. will remain unchanged

• The charge on condenser will reduce to one third

The true statement is, on increasing the distance between the plates of a parallel plate condenser

• The electric intensity between the plates will decrease

• The electric intensity between the plates will increase

• The electric intensity between the plates will remain unchanged

• The P.D. between the plates will decrease

Force of attraction between the plates of a parallel plate capacitor is

• $\frac{q^2}{2\epsilon_oAK}$

• $\frac{q^2}{\epsilon_oAK}$

• $\frac{q^{ }}{2\epsilon_oA}$

• $\frac{q^2}{2\epsilon_oA^2K}$

A frictionless dielectric plate S is kept on a frictionless table T. A charged parallel plate capacitance C (of which the plates are frictionless) is kept near it. The plate S is between the plates. When the plate S is left between the plates

• It will remain stationary on the table

• It is pulled by the capacitor and will pass on the other end

• It is pulled between the plates and will remain there

• All the above statements are false

A capacitor with air as the dielectric is charged to a potential of . If the space between the plates is now filled with a dielectric of dielectric constant 10, the potential difference between the plates will be

• 1000volts

• 100volts

• 10volts

• zero

A light bulb, a capacitor and a battery are connected together as shown here, with switch S initially open. When the switch S is closed, which one of the following is true

• The bulb will light up for an instant when the capacitor starts charging

• The bulb will light up when the capacitor is fully charged

• The bulb will not light up at all

• The bulb will light up and go off at regular intervals

If the capacity of a spherical conductor is 1 picofarad, then its diameter, would be

• $1\times10^{-3}m$

• $18\times10^{-3}m$

• $1.8\times10^{-5}m$

• $18\times10^{-7}m$

As in figure shown, if a capacitor C is charged by connecting it with resistance R, then energy is given by the battery will be

• $\frac{1}{2}CV^2$

• $more\ than\ \frac{1}{2}CV^2$

• $less\ than\ \frac{1}{2}CV^2$

• zero