A) A rheostat can be used as a potential divider
B) Kirchhoff's second law represents energy conservation
C) Wheatstone bridge is the most sensitive when all the four resistances are of the same order of magnitude.
D) In a balanced wheat stone bridge if the cell and the galvanometer are exchanged, the null point is disturbed. [JEE Main 2017]
Correct Answer: D
Solution :
[A]
On interchanging Cell & Galvanometer. 
On balancing condition \[\frac{{{R}_{1}}}{{{R}_{3}}}=\frac{{{R}_{2}}}{{{R}_{4}}}\] ?. [a] 
On balancing condition \[\frac{{{R}_{1}}}{{{R}_{2}}}=\frac{{{R}_{3}}}{R}\] As we see both equation [a] & [b] are same. So 4th statement is false.
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