QJEEAdv08Ph80f6: JEE Advanced 2008 Physics - Class 12 JEEAdv08Ph80f6 Solution: STATEMENT - 1 In a Meter Bridge experiment, null point for an…
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 increases with increase in temperature.
Multiple Choice Options
- A Statement - 1 is True, Statement - 2 is True; Statement - 2 is a correct explanation for Statement - 1
- B Statement - 1 is True, Statement - 2 is True; Statement - 2 is NOT a correct explanation for Statement - 1
- C Statement - 1 is True, Statement - 2 is False
- D Statement - 1 is False, Statement - 2 is True
Step-by-Step Verified Solution
When the temperature of a metal increases, its resistance will increase.
Therefore statement-2 is correct.
For meter bridge, when null point N is obtained, we get
When the unknown resistance is put inside an enclosure, maintained at a high temperature, then X increases. To maintain the ratio of null point, should also increase. But if we want to keep the null point at the initial position (i.e., if we want to change the value of ) to maintain the ratio, R should be increased.
Therefore, statement - 1 is false.