Calculate the effect internal resistance in series and parallel.

Explain the variation of resistivity of conductor and semiconductor with change in temperature.

A conductor of length I is connected to d.c. source of potential V. If the length of the conductor is doubled by treating it, keeping V constant, explain how do the following factors vary in the conductor
(i) Drift velocity.
(ii) Resistor
(iii) Resistivity.

The lengths & radii of three wires of the same metal in the radio 2: 3 : 4 & 3 : 4: 5 respectively. They are joined in parallel & included in a circuit having a 5 A current. Find current in each wire.

In a meter bridge, the balancing length is found to be 40 cm from end A. If the resistance of 10 \(\Omega \) is connected in series with R, balancing length is obtained 60 em from A. calculate the value R & S.