Opposite charges attract each other

Steps:

• Recall Coulomb's law: Like charges repel; opposite charges attract.
• Identify the rods as oppositely charged: one positive, one negative.
• Apply the law: The rods experience an attractive force when placed next to each other.
• Conclude: The rods move towards each other due to attraction.

Why C is correct:

• Opposite charges attract, as stated in Coulomb's first law of electrostatics, causing the rods to move towards each other.

Why the others are wrong:

• A: Wrong direction; opposite charges attract, not repel.
• B: Wrong direction and explanation; opposite charges attract, do not repel.
• D: Wrong explanation; opposite charges attract, not repel.

Final answer: C