Question

how is a conductor different from an insulator?

• conductors have magnetic fields; insulators do not have magnetic fields.
• conductors do not have magnetic fields; insulators do have magnetic fields.
• in a conductor, electric current cannot flow freely; in an insulator, it can flow freely.
• in a conductor, electric current can flow freely; in an insulator, it cannot flow freely.

Explanation:

To determine the correct answer, we analyze the properties of conductors and insulators. Conductors allow electric current to flow freely due to the presence of free electrons, while insulators restrict the flow of electric current as they have tightly bound electrons. Magnetic fields are not the distinguishing factor between conductors and insulators. So we evaluate each option:

• First option: Incorrect, as magnetic fields are not the key difference.
• Second option: Incorrect, the description of magnetic fields for conductors and insulators is wrong.
• Third option: Incorrect, it misstates the current - flow properties (says current can't flow in conductors and can in insulators, which is the opposite of reality).
• Fourth option: Correct, as it accurately describes the current - flow behavior of conductors (current can flow freely) and insulators (current cannot flow freely).

Answer:

The fourth option: In a conductor, electric current can flow freely; in an insulator, it cannot flow freely.