Question

Assertion (A): Copper is used to make electric wires.
Reason (R): Copper has very low electrical resistance.

  • Both (A) and (R) are true and (R) is the correct explanation of (A).

  • Both (A) and (R) are true but (R) is not the correct explanation of (A).

  • (A) is true but (R) is false.

  • (A) is true but (R) is false.

  • (A) is false but ($R$) is true.

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Answer

Explanation:

Assertion (A): Copper is used to make electric wires.
Reason (R): Copper has very low electrical resistance.

Here, the assertion states that copper is commonly used in manufacturing electric wires. The reason provided is that copper possesses a very low electrical resistance.

Understanding the relationship between these two statements involves knowing why low resistance is crucial for materials used in electrical wiring. When electrical current passes through a wire, any resistance within the wire can cause power losses, manifesting as heat. Ideally, to maximize energy efficiency and minimize costs associated with power loss (such as increased energy consumption and potential damage due to overheating), the resistance should be as low as possible.

Copper's low resistance means that when it is used in wires, the electrical current can flow more freely compared to materials with higher resistance. This minimizes power consumption and, consequently, the cost of electricity. Thus, using copper for electrical wiring directly influences the overall efficiency and safety of electrical systems.

Given this context, both the Assertion and the Reason are not only true but the Reason also correctly explains why copper is preferred for making electrical wires:

  • Both (A) and (R) are true because it is factual that:

    • Copper is indeed used widely in the manufacture of electric wires.
    • Copper has a very low electrical resistance, which is advantageous for reducing power loss in electrical circuits.
  • (R) is the correct explanation of (A) because the low electrical resistance of copper directly explains why it is chosen for electrical wiring — to minimize power losses and reduce operational costs.

The correct answer is then:

  • Both (A) and (R) are true and (R) is the correct explanation of (A).

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