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If two point charges, one is positive and other is negative are kept at a certain distance, then the electric field lines will:

If two point charges, one is positive and other is negative are kept at a certain distance, then the electric field lines will: Correct Answer start from positive charges and end at negative charges

CONCEPT:

Electric field lines:

  • An electric field line is an imaginary line along which a positive test charge will move if left free.
  • Electric field lines are drawn to represent the electric field.

Properties of electric field lines:

  • Electric field lines start from positive charges and end at negative charges. 

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  • In a charge-free region, electric field lines can be taken to be continuous curves without any breaks.

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  • The tangent at any point on the electric field line gives the direction of the electric field at that point.
  • Electric field lines due to a point charge never intersect each other.
  • The electric field lines never form a closed loop.
  • The density of the electric field lines at a point indicates the strength of the electric field at that point.

EXPLANATION:

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  • From the above, it is clear that electric field lines start from positive charges and end at negative charges. 
  • If there is a single positive charge then electric field lines start from positive charge and end at infinity. Similarly, if there is a single negative charge then electric field lines start from infinity and end at a negative charge. Hence, option 2 is correct.

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