CONTINUE CHAPTER 1-ELECTRIC FIELDS

COULOMB’S LAW OF VECTOR FORM

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DIELECTRIC CONSTANT

When the charges are situated in any other medium other than free space force between them is given 

Where, ɛ is called absolute electrical permittivity of intervening medium.

Dielectric constant of a medium is the ratio of absolute electrical permittivity of the medium to the absolute electrical permittivity of free space

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SUPERPOSITION PRINCIPLE

This principle states that force on any charge due to number of other charges at rest is the vector sum of all the forces, taken one at a time.

v  The forces due to individual charges are unaffected due to the presence f other charges.

Let there be many forces acting on other force..Then total force is their sum.

CHAPTER 1-ELECTRIC FIELDS

QUANTISATION OF ELETRIC CHARGE

This is the property due to which all free charges are integral multiple of basic unit of charge represented by e.

Representation| -e is a electron and +e is proton.

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COULOMB’S LAW

This law states that the force of interaction between two point charges is directly proportional to the product of charges and inversely proportional to the square of distance between them.

It obeys Newton’s Third Law of Motion

Where k is the electrostatic force constant

The value of electrostatic force constant depends on the nature of medium separating the charges and the system of units.

Where ɛ₀ is called the absolute electrical permittivity of free space