Assertion (A) :In a metrebridge ; Copper wire is connected in the left gap and silicon is connected in the right gap. When the temperature of both wires increase, balancing point shifts to right.
Reason (R) :Temperature coeficient of copper is (-)Ve and that of silicon is (+) Ve.

Both A & R are true and R is the correct explanation of A

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Both A & R are true and R is not a correct explanation of A

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A is true but R is false

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A is false but R is true

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Solution

The correct option is D A is true but R is false
The balancing point shifts to the right because the resistance of copper increases with temperature and that of silicon decreases with temperature.
Temperature coefficient of cu is +ve
Temperature coefficient of si is -ve.

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Assertion (A) :In a metrebridge ; Copper wire is connected in the left gap and silicon is connected in the right gap. When the temperature of both wires increase, balancing point shifts to right.Reason (R) :Temperature coeficient of copper is (-)Ve and that of silicon is (+) Ve.

The correct option is D A is true but R is falseThe balancing point shifts to the right because the resistance of copper increases with temperature and that of silicon decreases with temperature.Temperature coefficient of cu is +veTemperature coefficient of si is -ve.

Assertion (A) :In a metrebridge ; Copper wire is connected in the left gap and silicon is connected in the right gap. When the temperature of both wires increase, balancing point shifts to right.
Reason (R) :Temperature coeficient of copper is (-)Ve and that of silicon is (+) Ve.

The correct option is D A is true but R is false
The balancing point shifts to the right because the resistance of copper increases with temperature and that of silicon decreases with temperature.
Temperature coefficient of cu is +ve
Temperature coefficient of si is -ve.