What is the tendency of a material to oppose the flow of charge?

Could someone . i have tried to solve myself but my calculation is off

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance