Electrostatics

Fill the Sentence

Read the paragraph below and fill in the missing words.

Electric charges interact though they are not in contact. To explain how this happens, the concept of is introduced. An is experienced when an is placed in an electric field. Theoretically electric field extends upto .

Intensity of electric field at any point in an electric field is defined as experienced by positive charge placed at that point.

The concept of lines of force was introduced by Michael Faraday to represent visually.  An electric line of force is a path, straight or curve, along which an positive charge moves; if it is free to do so. 

The to the line of force at any point gives the direction of electric field at that point. 

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DropDown Activity

Read and complete

The electric flux is considered as if the electric lines of force go away (radially outward) from a surface. On the other hand, it is considered as if the electric lines of force enter(radially inward) in to a surface

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When the surface is placed perpendicular to the electric field, number of electric field lines or electric lines of force will pass through the surface.

When the surface is placed parallel to the electric field,  number electric lines of force will pass through the surface.

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True-False Question

Question 1

Unit Positive charge consists huge number of basic charges so that it can't be used as a test charge

Question 2

The term field in Physics generally refers to a quantity that is defined at every point in space and may vary from point to point

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Question

Physical Significance of Electric field

Electric field at a point in space around a charge or system of charges tells the ____________ a unit positive test charge would experience if its is placed at that point without disturbing the source 

Answers

Energy

Potential

Force

Charge

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Characteristics of Lines of force

  1. All originate from charge and terminate on the charge
  2. The number of lines of force is proportional to the of the charge
  3. No lines of force exist inside a conductor
  4. The electric lines of force always enter or leave the charged surface .
  5. Electric lines of force can never each other. 
  6. The electric lines of force cannot pass through a .
  7. to the any line force at a point gives the direction of electric field at that point
  8. When two opposite charges are placed close to each other, the electric lines of force present between them will become in length
  9. When two like charges are placed closer to each other, the electric lines of force present between them will become in length.
  10.  In a uniform electric field, lines of forces are

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Electric Flux

Electric flux through a surface is the total number of passing normal through the surface. Electric flux is a quantity. It is the integral of the electric field over the whole surface.

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