**Electric field**-The region around a particular charge in which its electrical effects can be observed is called the electric field of the charge

-Electric field has its own existence and is present even if there is no charge to experience the electric force.

**Electric field Intensity:**

**E**=

**F**/q

_{0}

Where

**F**is the electric force experience by the test charge q

_{0}at this point.

It is the vector quantity

**Some point to note on this**1.Electric field lines extend away from the positive charge and towards thge negative charges

2. Electric field produces the force so if a charge q is placed in the electric field E the force experience by the charge is

**F**=q

**E**

3 Principle of superposition also applies to electric field

so

**E**=

**E**

_{1}+

**E**

_{2}+

**E**

_{3}+

**E**

_{4}+......

Electric field intensity due to point charge

**E**=KQ

**r**/r

^{2}

Where r is the distance from the point charge and

**r**is the unit vector along the direction from source to point.

**Some useful Formule**

**Electric field for the Uniformly charged ring**

E=KQx/(r

^{2}+x

^{2})

^{3/2}

Where x is the distance from the center of the ring

At x=0

E=0

**Electric Field due to uniformly charged disc**

E=(σ/2ε

_{0})(1- x/(√R

^{2}+x

^{2}))

σ=Surface charge density of the disc

At x=0

E=σ/2ε

_{0}

**Electric Field Intensity due to Infinite sheet of the charge**

E=σ/2ε

_{0}

σ=Surface charge density of the sheet

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