In the circuit shown if figure, `XY` is potentiometer wire `100 cm` long. The circuit is connected as shown. With switches `S_(2)` and `S_(3)` open, a balance point is found at `Z`. After switched `S_(1)` has remaind closed for some time, it is found that contact at `Z` must be moved towards `Y` to maintain a balance. which of the following in most likely reason for this ? A. The cell `V_(1)` is running downB. The cell `V_(2)` is running downC. The wire `XZ` is getting warm and its resistance is increasingD. The resistor `R_(1)` is getting warm and increasing in value.

In the circuit shown if figure, `XY` is potentiometer wire `100 cm` lo

1.	In the circuit shown if figure, `XY` is potentiometer wire `100 cm` long. The circuit is connected as shown. With switches `S_(2)` and `S_(3)` open, a balance point is found at `Z`. After switched `S_(1)` has remaind closed for some time, it is found that contact at `Z` must be moved towards `Y` to maintain a balance. which of the following in most likely reason for this ? A. The cell `V_(1)` is running downB. The cell `V_(2)` is running downC. The wire `XZ` is getting warm and its resistance is increasingD. The resistor `R_(1)` is getting warm and increasing in value.
Answer» Correct Answer - A (a) If `V_(1)` decrease, then potential differential across `xz` will decrease. So to have same potential difference i.e., `V_(2)` across `xz`, length `xz` has to be increased or `z` should be moved towares `y`. (b) is correct, because for this `z` should have been moved toward `x`. (c ) Will be incorrect because `xz` can get warm up if current through it increase which is not possible. (d) is incorrect, because which is no current in `R_(1)`.

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