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A : The potentiometer wire should hav...

A : The potentiometer wire should have uniform cross sectional area.
R : On the pottentiometer wire the jockey is gently tocuhed , not pressed hard.

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion , then mark

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion then mark.

C

If Assertion is ture statement but Reason is false , then mark

D

If both Assertion and Reason are false statements then mark.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason given and determine their correctness and the relationship between them. ### Step-by-Step Solution: 1. **Understanding the Assertion:** - The assertion states: "The potentiometer wire should have a uniform cross-sectional area." - This statement is **correct** because a uniform cross-sectional area ensures that the resistance per unit length of the wire remains constant. If the cross-section varies, the resistance will also vary, leading to inaccurate measurements when using the potentiometer. **Hint:** Consider how resistance is affected by the dimensions of a conductor. 2. **Understanding the Reason:** - The reason states: "On the potentiometer wire, the jockey is gently touched, not pressed hard." - This statement is also **correct**. The jockey (the contact point used to measure potential difference) should be gently touched to avoid damaging the wire. Pressing hard can create local heating or damage the wire, leading to erroneous readings. **Hint:** Think about the physical effects of applying pressure on a delicate wire. 3. **Analyzing the Relationship:** - While both the assertion and reason are correct, the reason does not explain why the potentiometer wire should have a uniform cross-sectional area. The assertion is about the necessity of uniformity for accurate measurements, while the reason is about the proper handling of the jockey. **Hint:** Reflect on whether the reason logically supports the assertion. 4. **Conclusion:** - Since both the assertion and reason are true but the reason does not provide a correct explanation for the assertion, the correct option is that both are true, but the reason is not the correct explanation of the assertion. ### Final Answer: - Both assertion and reason are true, but the reason is not the correct explanation of the assertion. **Correct Option:** B
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