First slide

combination of resistance

Question

In the network shown, current flowing through the 8 volt cell is

Moderate

A

6 A
B

8 A
C

7.5 A
D

4 A

Solution

The network is a balanced wheat stone bridge. So the $1 Ω$ resistor between C and D can be removed.
$\begin{array}{l} ∴ R_{c} = \frac{(1 + 1) (1 + 1)}{(1 + 1) (1 + 1)} Ω = 1 Ω \\ ∴ i = \frac{ε}{R_{c}} = \frac{8}{1} A = 8 A \end{array}$

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