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For a metre Bridge, Choose the incorrect option from the following. |
The wire of one meter length fixed on the wooden plank is a uniform conducting wire having constant resistance per unit length. Metre Bridge is not suitable to measure very low resistances. Interchanging the position of the galvanometer and the cell will not change the balance point on the wire $X/Y = I_1/I_2$. The internal resistance of the cell affects the balancing position of null point. |
The internal resistance of the cell affects the balancing position of null point. |
The correct answer is Option (4) → The internal resistance of the cell affects the balancing position of null point. (A) Correct — Metre bridge wire is uniform and 1 m in length. (B) Correct — Very low resistances are difficult to measure accurately with a metre bridge. (C) Correct — Interchanging galvanometer and cell does not affect the balance point; ratio $X/Y = I_1/I_2$ still holds. (D) Incorrect — Internal resistance of the cell does not affect the null point; it only affects current, not the balance condition. Incorrect option: (D) |
