1. Draw a neat diagram of Wheatstone’s dc bridge
Draw a neat diagram of Wheatstone’s dc bridge. Obtain the condition required to balance an ac bridge
Four resistances R1,R2, R3 and
R4 are connected along four
sides of a quadrilateral ABCD
An dc V voltage source is
connected across one of the
diagonal and a galvanometer
G is connected across another
diagonal
I1, I2, I3 and I4 and the currents through R1, R2, R3 and R4

2. A bridge is said to be balanced when there is no current through D
This happens when points B and D are at same potentials with respect to points A and C
and

3. Since ID = 0
and

4. Draw a neat diagram of a general ac bridge
Draw a neat diagram of a general ac bridge. Obtain the condition required to balance an ac bridge
Four impedances Z1, Z2, Z3 and
Z4 are connected along four
sides of a quadrilateral ABCD
An ac V voltage source is
connected across one of the
diagonal and a detector D is
connected across another
diagonal
I1, I2, I3 and I4 and the currents through Z1, Z2, Z3 and Z4

5. A bridge is said to be balanced when there is no current through D
This happens when points B and D are at same potentials with respect to points A and C
and

6. Since ID = 0
and

7. Explain how the value of unknown inductance can be measured with the help of Maxwell’s inductance bridge
One arm consists of a standard inductance LS in series with resistor RS. The adjacent arm consists of unknown inductance LX having resistance RX. Other two arms consists of resistances R1 and R2

8. When bridge is balanced

9. With the help of neat circuit diagram, explain the use of Maxwell’s L/C bridge to find the value of unknown inductance.
One arm consists of a unknown inductance LX in having resistance RX. The opposite arm consists of resistance R4 in parallel with capacitor C. Other two arms consists of resistances R2 and R3

10. When bridge is balanced

11. Explain how the value of unknown capacitance can be measured with the help of De Sauty’s capacitance bridge
De Sauty’s capacitance
bridge is used
for comparison of two
capacitors
If one of them is standard
capacitance then the value
of the other can be found
Two resistances are connected
in adjacent arm
Two capacitors are connected in
the remaining arms

12. When bridge is balanced

13. Draw a neat diagram of Wien bridge
Draw a neat diagram of Wien bridge. Obtain the condition required to balance the bridge
One arm consists of a resistance R1
in series with capacitor C1.
The adjacent arm consists
of resistance R2 in parallel
with capacitor C2.
Other two arms consists of
resistances R3 and R4

14. When bridge is balanced