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Which of the following statements is false ? (1) Wheatstone bridge is the most sensitive when all the four resistances are of the same order of magnitude (2) In a balanced Wheatstone bridge if the cell and the galvanometer are exchanged, the null point is disturbed (3) A rheostat can be used as a potential divider (4) Kirchhoff's second law represents energy conservation
- (1) Wheatstone bridge is the most sensitive when all the four resistances are of the same order of magnitude
- (2) In a balanced Wheatstone bridge if the cell and the galvanometer are exchanged, the null point is disturbed
- (3) A rheostat can be used as a potential divider
- (4) Kirchhoff's second law represents energy conservation
Correct answer: (2) In a balanced Wheatstone bridge if the cell and the galvanometer are exchanged, the null point is disturbed
Solution
In a balanced Wheatstone bridge, the null point is achieved when the ratio of the resistances is equal, and exchanging the cell and galvanometer disrupts this balance, causing the null point to shift.
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