the battery during charging? What is the purpose of having a series resistor in the charging circuit? . In a potentiometer arrangement, a cell of emf .
V gives a balance point at . cm length of the wire. If the cell is replaced by another cell and the balance point shifts to . cm, what is the emf of the second cell?
. The number density of free electrons in a copper conductor estimated in Example . is . × m – .
How long does an electron take to drift from one end of a wire . m long to its other end? The area of cross-section of the wire is . × – m and it is carrying a current of .