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 ?

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In the circuit shown if figure, XY is potentiometer wire 100cm long. The circuit is connected as shown. With switches S2 and S3 open, a balance point is found at Z. After switched S1 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 ?
13
Nov
In the circuit shown if figure, XY is potentiometer wire 100cm long. The circuit is connected as shown. With switches S2 and S3 open, a balance point is found at Z. After switched S1 has remaind closed for some time, it is found that contact at Z must be moved towards Y to maintain a [...]
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Tags: a balance point is found at Z. After switched S1 has remaind closed for some time , In the circuit shown if figure , 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 ? , XY is potentiometer wire 100cm long. The circuit is connected as shown. With switches S2 and S3 open ,