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.

An aluminium wire of diameter 0.24 cm is connected in series to a copper wire of diameter 0.16 cm. The wires carry an electric current of 10 A. Determine the current density in aluminium wire.

In a wheat stone bridge circuit P = 7, Q = 8 , R = 12 & s = 7. Find the additional resistance to be used in series with S, so that the bridge is balanced.

Using Kirchhoff's laws in the given circuit determine
(i) the voltage drop across the unknown resistor 'R'
(ii) the current 'I' in the ohm EF.

Calculate the value of the resistance 'R' in the circuit shown in the figure so that the current in the circuit is 0.2 A. What would be the potential difference between points A and B?