In a Wheatstone bridge, when the condition R1/R2 = R3/R4 is satisfied, then the current passing through the galvanometer will be
Correct answer: B. equal to 0 A.
- A. less than 0 A.
- B. equal to 0 A.
- C. equal to 1 A.
- D. more than 1 A.
Explanation
When the ratio of resistances in a Wheatstone bridge satisfies the condition R1/R2 = R3/R4, the bridge is said to be balanced. In this balanced state, no current flows through the galvanometer, resulting in a reading of 0 A. This occurs because the potential difference across the galvanometer becomes zero, leading to no current passing through it. The other options are incorrect as they do not align with the behavior of a Wheatstone bridge under balanced conditions.
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Resistance measures opposition to current in a conductor and follows R = V/I for an ohmic conductor, while resistivity is an intrinsic property of the material. Questions use R = ρL/A, examine effects of length, cross-sectional area and temperature, and distinguish resistance, resistivity, conductance and conductivity.
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