elecrostatics

35
Created on By buzzerkings

Electrostatics

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 Relative permittivity of a material is 10, It's absolute or actual permittivity is

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The difference of potential energy per unit charge is called

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Two point charges +2C and +6C repel each other with a force of 12 N. If a charge of -2C given to each of these charges, the force will now be 

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How many electrons will have a charge of one coulomb?

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The electric field strength between a pair of parallel plates is E. The separation of the plates is doubled and the potential difference between the plates is increased by a factor of four. What is the new electric field strength?

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Two plates are 2cm apart. If a potential difference of 10 volts is applied between the plates. The electric field between the plates will be

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Two metal plates have potential difference of 300 V and are 0.01 m apart. A charged particle of mass 1.96 x 10^-15 kg is held in equilibrium between the plates of the capacitor. Then the electric field is

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 While a capacitor remains connected to a battery, a dielectric slab is placed between the plates:

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A capacitor with air as the dielectric is charged to a potential of 100 volt. If the space between the plate is now filled with a dielectric of dielectric constant 10, the potential difference between the plates will be

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Two electrons are removed from a conductor the charge on it is

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 If the dielectric constant and dielectric strength be denoted by K and K' respectively then a material suitable for use as a dielectric in a capacitor must have 

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The electric potential at the surface of an atomic nucleus (Z= 50) of radius 9.0 × 10^-15 m is

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If the potential difference across the two plates of a parallel plate capacitor is doubled then its energy stored in it will be:

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When 10^19 electrons are removed from a neutral metal plate, the electric charge on it is (coulomb) 

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The space between the plates of a capacitor is filled by a liquid of dielectric constant k. The capacitance of the capacitor

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Two plates are 1 cm apart and the potential difference between them is 10 volts. The electric field between the plates is

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The magnitude of electric intensity E is such that an electron placed in it would experience an electrical force equal to its weight. E is given by

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 If F is the force between two points charges submerged in a medium of dielectric constant K, then on withdrawing the medium, the force between the charges becomes

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Capacitance with air is 10F, if a dielectric of εr= 100 is inserted then new capacitance 

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 Potential due to charge q at distance 1m is 5V, at distance 3m will be

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Neutral zone in electric field of two similar charges is region where

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Two identical metal balls with charges + 2Q and -Q are separated by some distance, and exert a force F on each other. They are joined by a conducting wire, which is then removed. The force between them will now be.

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 If a 2µF capacitor has a charge of 20μC, the potential difference between the plates is:

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A capacitor of capacitance 2µF is connected with a battery of 12 volt, the charge store is equal to:

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Two point charges are separated by a distance of 4m. The force between them is 4N. What is the force between the charges, when the distance between them is 1m

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The force between two point charges placed in air is F. if air is replaced by a medium of relative permittivity εr, the force is reduced to

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The space between the plates of a capacitor is filled by a dielectric constant k. The capacitance of the capacitor

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 If a 10 F capacitor is to have an energy content of 20J, it must be placed across a potential difference of

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A hollow sphere of copper is positively charged. Then the electric field inside the sphere is

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The weight of proton (mass = 1.67 x 10^-27 kg) on entering in a vertical electric field E is balanced by electric force. Then the electric field strength is

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A capacitor of capacitance C is connected to battery of emf Vo. Without removing the battery, a dielectric of strength εr, is inserted between the parallel plates of the capacitor C, then the charge on the capacitor is

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If the distance between two-point charges to becomes double then the coulomb's force will be

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The energy stored between the plates of a capacitor in not represented by 

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A and B are two points in an electric field. If the work done in carrying 4.0 coulomb of electric charge from A to B is 16.0 joule the potential difference between A and B is

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The capacity of a condenser in which a dielectric of dielectric constant 5 has been used, is C. If the dielectric is replaced by another with dielectric constant 20, the capacity will become

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 The electric field intensity at a point 20 cm away from a charge of 2×10^-5C is

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What is the area of the plates of a 3F parallel plate capacitor, if the separation between the plates is 5mm

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A charged conductor has charge on its

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12 J of work is to be done against an existing electric field to take a charge of 0.01 C from A to B. Find The potential difference between B and A.

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