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In the circuit shown if figure, XY is po...

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 down

B

The cell `V_2` is running down.

C

The wire XZ is getting warm and its resistance is increasing.

D

The resistor `R_1` is getting warm and increasing in value.

Text Solution

Verified by Experts

The correct Answer is:
A
a. If `V_1`decreases, the potential difference across xz will decrease. So to have potential difference, i.e. , `V_2` across xz, length xz has to be increased or z should be moved toward y.
b. is incorrect because for this , z should have been moved toward x.
c. will be incorrect because xz can get warm up if current through it increases which is not possible .
d. is incorrect because there is no current in `R_1` .
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