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Why are electric field lines perpendicul...

Why are electric field lines perpendicular at a point on an equipotential surface of a conductor ?

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If the electric field lines are not normal to the surface, then the electric field will have a non-zero component along the surface. Therefore, the external agent needs to do work in order to move a charged particle on this surface, which is against the property of equipotential surfaces.
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MODERN PUBLICATION-ELECTROSTATIC POTENTIAL AND CAPACITANCE -Revision Exercises (Very Short Answer Questions)
  1. What is the amount of work done to move a point charge from one point ...

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  2. Can two different equipotential surfaces intersect each other?

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  3. Why are electric field lines perpendicular at a point on an equipotent...

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  4. Two charges +2muC and -2muC are placed at points A and B, 5 cm apart. ...

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  5. What is potential gradient ? How is it measured ? Explain.

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  6. What do you understand by potential gradiednt ? Establish a relation...

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  7. What do you mean by electric potential energy of a system of charges?

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  8. Write different expression for the energy stored in a capacitor.

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  9. Write an expression for potential energy of two charges q(1) and q(2) ...

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  10. What is the amount of work done in moving a point charge around a circ...

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  11. Define dielectric constant.

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  12. How will electric field inside a dielectric change on polarisation?

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  13. What do you mean by electrostatic shielding?

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  14. What is dielectric strength?

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  15. What is the value of dielectric strength for air?

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  16. What is the dimensional formula of dielectric constant?

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  17. What are polar dielectrics?

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  18. Give two examples of polar dielectrics.

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  19. What is the value of electric susceptibility for vacuum?

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  20. What is the physical significance of electric susceptibility?

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