Question

What are the significant of electric line of force

Answer 1

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Lines of force originate from a positive charge and terminate to a negative charge. The tangent to the line of force indicates the direction of the electric field and electric force. Electric lines of force are always normal to the surface of charged body.
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Answer 2

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An electric line of force is an imaginary straight or curved path along which a small positive test charge is supposed to move when free to do so. The tangent at a point on an electric line of force gives the direction of the resultant electric field at that point.