(a) Circuit Diagram – Three Resistors in Parallel:
```
+-------+-------+-------+
| | | |
[R1] [R2] [R3]
| | | |
+-------+-------+-------+
| |
[A] (Ammeter in main line)
| |
[Battery +→–] [Key K]
|_______________________|
```
The voltmeter (V) is connected across any one resistor (i.e., across the parallel combination). Current flows from the positive terminal of the battery through the ammeter, splits through R1, R2, R3 simultaneously, recombines, and returns to the negative terminal.
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(b) Equivalent Resistance:
(Since the exact diagram is not visible, the standard approach is shown. Assuming a typical combination where some resistors are in series and some in parallel — e.g., two 2 Ω resistors in parallel combined in series with a 2 Ω resistor, giving:)
Parallel part: $\dfrac{1}{R_p} = \dfrac{1}{2} + \dfrac{1}{2} = 1 \Rightarrow R_p = 1\ \Omega$
Series: $R_{eq} = R_p + 2 = 1 + 2 = \mathbf{3\ \Omega}$
(Apply the same series/parallel rules to the actual values given in the printed diagram.)
Source: Chapter 11 – Electricity, Section 11.6 Resistance of a System of Resistors
---