How is a conducter different from an insulater

A conducter will allow electricity to flow through it. An insulator cannot conduct electricity.

Condutor is a Material which permits the electric current or heat to pass through it.

insulater a substance which does not readily allow the passage of heat or sound.        

Thermal Conductivity of conducter is High.  

Thermal Conductivity  of insulater is low.  

conducter Covalent bond  is Weak.    

insulater  Covalent bond  is  Strong.  

conducter  electrons will freely move.

insulater electrons will not freely move.

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

there are no components of a physical goal mentioned on the list of choices that you've provided.