Answer: Zero.
- A Maximum
- B Uniform
- C Zero
- D Equal to external field
Correct answer: C. Zero
Explanation: Inside a conductor in electrostatic equilibrium, free charges redistribute until E = 0 everywhere inside.
Field lines always point from positive to negative charge, are denser where the field is stronger, and never cross; an isolated positive charge has lines radiating symmetrically outward, while a dipole's lines curve from the positive to the negative charge.
Concept context
Coulomb's law, electric field, potential, capacitors, Gauss's law.