- Exam
- JEE Main
- Year
- 2022
- Date
- 29 July
- Shift
- Evening Shift
- Subject
- Physics
- Chapter
- Current Electricity
JEE Main 2022 · 29 July · Evening Shift · Physics · Current Electricity
Given below are two statements: one is labelled as Assertion A and...
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Alloys such as constantan and manganin are used in making standard resistance coils.
Reason R: Constantan and manganin have very small value of temperature coefficient of resistance.
In the light of the above statements, choose the correct answer from the options given below.
Options
- ABoth A and R are true and R is the correct explanation of A
- BBoth A and R are true but R is NOT the correct explanation of A.
- CA is true but R is false.
- DA is false but R is true.
Correct answer
A. Both A and R are true and R is the correct explanation of A
Step-by-step solution
The alloys manganin and constantan are used for making standard resistance coils as they have high resistivity, low-temperature coefficient of resistance, ability to attain good resistance values in small size. Their resistance value would change very little with temperature.
Thus, both A and R are true and R is the correct explanation of A.