Which of these is a FALSE statement?

• A

  The Wheatstone bridge is most sensitive when all the four resistances are of the same order.

• B

  In a balanced Wheatstone bridge, interchanging the positions of galvanometer and cell affects the balance of the bridge

• C

  Kirchhoff's first law (for currents meeting at a junction in an electric circuit) expresses the conservation of charge.

• D

  The rheostat can be used as a potential divider.