Reason : The current flows towards the point of the higher potential, as it does in such a circuit from the negative to the positive terminal.


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.



Reason : The average velocity of free electron is zero.