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NEETPhysicsCurrent Electricity

Statement 1: In a Meter Bridge experiment, null point for an unknown resistance is measured. Now, the unknown resistance is put inside an enclosure maintained at a higher temperature. The null point can be obtained at the same point as before by decreasing the value of the standard resistance. and Statement 2: Resistance of a metal increase with increase in temperature.

Options

  1. AStatement 1 is true, Statement 2 is true, Statement 2 is a correct explanation for Statement 1.
  2. BStatement 1 is true, Statement 2 is true, Statement 2 is not a correct explanation for Statement 1.
  3. CStatement 1 is true, Statement 2 is false.
  4. DStatement 1 is false, Statement 2 is true

Correct answer

D. Statement 1 is false, Statement 2 is true

Step-by-step solution

With increase in temperature, the value of unknown resistance will increase. In balanced Wheatstone bridge condition, R X = l₁ l₂ Here, R= value of standard resistance, X= value of unknown resistance . To take null point at same point or l₁ l₂ to remain unchanged, R X should also remain unchanged. Therefore, if X is increasing R should also increase. correct option is (d).

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