Charge on a charged conductor resides
Correct answer: B. on its outer surface, concentrating most where the surface is sharply curved
- A. uniformly throughout its volume
- B. on its outer surface, concentrating most where the surface is sharply curved
- C. at its centre
- D. only where it was first placed
Explanation
Mutual repulsion drives the charges as far apart as possible, so they collect on the outside, and the surface charge density is highest at points and edges. This concentration produces the very strong field that ionises the surrounding air at a sharp point, which is the principle of the lightning conductor. Inside the metal the field remains zero.
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About Electric Field
An electric field is the force experienced per unit positive test charge, with the field of a point charge given by E = kQ/r² and directed away from positive charges or toward negative charges. Questions involve field lines, superposition and force on a charge, while electric field must be distinguished from electric potential.
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