V-I graph for two conducting wires A and B are as shown. If both wires are of the same length and same diameter, which of the two is made of a material of high resistivity? Give reasons to justify your answer.
V-I graph for two conducting wires A and B are as shown. If both wires are of the same length and same diameter, which of the two is made of a material of high resistivity? Give reasons to justify your answer.
Official answer
The wire with the higher resistivity is B.
Marking scheme
- 1.The V-I graph for two conducting wires A and B are as shown. The slope of the graph represents the resistance of the wire. The steeper the slope, the higher the resistance. In this case, the slope of wire B is steeper than that of wire A. Therefore, wire B has a higher resistance than wire A. Since both wires are of the same length and same diameter, the material of wire B must have a higher resistivity than that of wire A.
Hint
The V-I graph for two conducting wires A and B are as shown. The slope of the graph represents the resistance of the wire. The steeper the slope, the higher the resistance. In this case, the slope of wire B is steeper than that of wire A. Therefore, wire B has a higher resistance than wire A. Since both wires are of the same length and same diameter, the material of wire B must have a higher resistivity than that of wire A.
Quick oral answer
The V-I graph for two conducting wires A and B are as shown. The slope of the graph represents the resistance of the wire. The steeper the slope, the higher the resistance. In this case, the slope of wire B is steeper than that of wire A. Therefore, wire B has a higher resistance than wire A. Since both wires are of the same length and same diameter, the material of wire B must have a higher resistivity than that of wire A.
Common mistakes
- 1.Confusing resistivity with resistance
- 2.Not considering the length and diameter of the wires
Analysis and explanation
The V-I graph for two conducting wires A and B are as shown. The slope of the graph represents the resistance of the wire. The steeper the slope, the higher the resistance. In this case, the slope of wire B is steeper than that of wire A. Therefore, wire B has a higher resistance than wire A. Since both wires are of the same length and same diameter, the material of wire B must have a higher resistivity than that of wire A.
Interesting facts
The V-I graph for two conducting wires A and B are as shown. The slope of the graph represents the resistance of the wire. The steeper the slope, the higher the resistance. In this case, the slope of wire B is steeper than that of wire A. Therefore, wire B has a higher resistance than wire A. Since both wires are of the same length and same diameter, the material of wire B must have a higher resistivity than that of wire A.
Question details
Q25 of 39 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2023
- Section
- Section B
- Marks
- 2
- Type
- Very Short Answer
- Chapter
- Electricity
- Topic
- Electricity
- Bloom's level
- Knowledge
- Syllabus topic
- Electricity
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2023?
This question carries 2 marks in the CBSE Class 10 Science 2023 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Electricity" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Electricity" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2023 paper?
This is a Very Short Answer question from Section B in the CBSE Class 10 Science 2023 paper.