In a metre bridge experiment, the setup involves a balance condition for determining unknown resistance using a known resistance. The key components of the meter bridge are the galvanometer (G), the cell (E), and resistors \(R_1\) and \(R_2\) connected across the bridge.

In this particular problem, the positions of the cell (E) and the galvanometer (G) are interchanged. We need to analyze the effect of this interchange on the galvanometer's deflection.

Explanation:

1. When the positions of the galvanometer and the cell are interchanged, the principle of the meter bridge still applies, but the detection of balance point changes.
2. Initially, the galvanometer detects the point of zero current flow when the bridge is at balance. However, with the positions interchanged:
   • The galvanometer being used at the position of the cell will cause it to deflect when there is any potential difference across the bridge.
   • The cell now at the previous position of the galvanometer will maintain a potential difference across the bridge regardless of the deflection.
3. Due to these changes, two situations arise when using the jockey (sliding contact) across the wire:
   • There will be right-sided and left-sided deflections as the jockey moves across the bridge wire, depending on the current direction.
   • At a particular point (the balance point), the potential across both sides is equal, and the galvanometer shows a zero deflection, indicating balance.

Conclusion:

The correct observation in the galvanometer, given the interchange of the cell and galvanometer positions, is: Both right-sided and left-sided deflection and at balance point no deflection.