Question 162: Current Electricity

Question

In the given figure switches S
1
and S
2
are in open condition. The resistance across ab when the switches S
1
and S
2
are closed is _____________ $\Omega$.
![](https://imagex.cdn.examgoal.net/1krs9yy6s/06d6c0bb-5f40-404e-bdcb-57cc8e115d26/9bd07540-f244-11eb-b943-03b9b3fb9629/file-1krs9yy6t.jpg)

Accepted Answer

When switch S
1
and S
2
are closed
R
ab
= ${{12 	imes 6} \over {12 + 6}} + 2 + {{6 	imes 12} \over {6 + 12}}$
= ${{72} \over {18}} + 2 + {{72} \over {18}} = 4 + 2 + 4 = 10\Omega $
![](https://app-content.cdn.examgoal.net/fly/@width/image/1l46x5no7/ab83da9e-9598-44ac-9c2e-b6905a212f86/d9f6c270-e7e4-11ec-9570-5bc44f917fce/file-1l46x5no8.png?format=png)

Current Electricity

In the given figure switches S 1 and S 2 are in open condition. The resistance across ab when the switches S 1 and S 2 are closed is _____________ \Omega.

Integer / Numeric Answer Type