Correct Option
The correct option is (c).
Explanation
Electrostatics is governed by fundamental laws describing the interaction between electric charges. Benjamin Franklin introduced the convention of two types of charges: positive and negative. The interaction between these charges dictates the forces of attraction or repulsion.
Statement-wise Analysis
- Statement 1 is Correct: It is a fundamental property of electric charges that like charges (charges of the same sign, such as positive-positive or negative-negative) repel each other.
- Statement 2 is Incorrect: Charges of different kinds (unlike charges, such as positive and negative) attract each other. They do not repel.
- Statement 3 is Correct: By convention, a glass rod rubbed with silk acquires a positive charge, while a plastic straw rubbed with polythene acquires a negative charge. Since the glass rod and the plastic straw carry opposite charges, they attract each other.
Key Takeaway
Fundamental Law of Electrostatics: Like charges repel each other, while unlike charges attract each other.