The outer sphere of a spherical air capacitor is earthed. For increasing its capacitance ____.
vacuum is created between two spheres
dielectric material is filled between the two spheres
the space between two spheres is increased
the earthing of the outer sphere is removed
5
1.25
4
2.5
Force acting upon a charged particle kept between the plates of a charged condenser is. If one plate of the condenser is removed, then the force acting on the same particle becomes ____.
0
Two metallic charged spheres whose radii are 20 and 10 respectively have each 150 positive charge. The common potential after they are connected by a conducting wire is ____.
The dielectric constant of an insulator cannot be ____.
3
6
8
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 parallel plate capacitor is charged and the charging battery is then disconnected. If the plates of the capacitor are moved further apart by means of insulating handles, then ____.
the charge on the capacitor increases
the voltage across the plates decreases
the capacitance increases
the electrostatic energy stored in the capacitor increases
A capacitor with air as the dielectric is charged to a potential of 100 volts. If the space between the plates is now filled with a dielectric of dielectric constant 10, the potential difference between the plates is ____.
1000
100 Volts
10 Volts
Zero
The distance between the circular plates of a parallel plate condenser in diameter, in order to have same capacity as a sphere of radius is ____.
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