Assertion: An AC can be transmitted over long distances without much power loss.
Reason: An AC can be stepped up or down with the help of a transformer.

Options

A. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C. If Assertion is true but Reason is false.
D. If Assertion is false but Reason is true.

Answer

To analyze the assertion and reason provided in the question, we will break down the concepts involved step by step.

### Step 1: Understand the Assertion
The assertion states that "An AC can be transmitted over long distances without much power loss." This is true because alternating current (AC) can be transmitted efficiently over long distances. The power loss during transmission is primarily due to the resistance of the transmission lines, which causes energy to be lost as heat.

**Hint:** Consider the factors that contribute to power loss in electrical transmission.

### Step 2: Understand the Reason
The reason states that "An AC can be stepped up or down with the help of a transformer." This is also true. Transformers are devices that can increase (step up) or decrease (step down) the voltage of AC electricity. By stepping up the voltage for transmission, the current can be reduced, which minimizes power loss due to resistance in the wires.

**Hint:** Recall how transformers work and their role in changing voltage levels.

### Step 3: Analyze the Relationship Between Assertion and Reason
While both the assertion and reason are true, we need to determine if the reason correctly explains the assertion. The ability to step up or down the voltage using transformers is a significant factor in the efficiency of AC transmission, but it does not directly explain why AC can be transmitted over long distances without much power loss.

**Hint:** Think about whether the reason provides a direct cause for the assertion.

### Step 4: Conclusion
The assertion is true, and the reason is also true; however, the reason does not adequately explain the assertion. The efficiency of AC transmission over long distances is primarily due to the high voltage and low current achieved through transformers, which reduces power loss. Therefore, while the reason is relevant, it does not directly justify the assertion.

**Final Statement:** The assertion is true, and the reason is true, but the reason is not the correct explanation for the assertion.

### Summary of Steps:
1. Understand the assertion about AC transmission.
2. Understand the reason regarding transformers.
3. Analyze the relationship between the assertion and reason.
4. Conclude the validity of both statements.