In a Wheatstone bridge circuit \(\rho =10\Omega \), \(Q=12\Omega \) and,\(R=8\Omega \) then find the value of S which is parallel to R.

3

(a)

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

3

(a)

The Wheatstone bridge circuit have the resistances in various arms as shown in figure. Calculate the current through the galvanometer.

3

(a)

Write any two factors on which internal resistance of a cell depends. The reading on a high resistance voltmeter, when a cell is connected across it, is 2.2 V. When the terminals of the cell are also connected to a resistance of 5\(\Omega \) as shown in the circuit, the voltmeter reading drops to 1.8 V. Find the internal resistance of the cell.

3

(a)

A potentiometer wire of length 1 m has a  resistance of 10\(\Omega \). It is connected to 6 V battery in series with a resistance of 5\(\Omega \). Determine the emf of the primary cell, which gives a balance point at 40 cm.

3

(a)