ICSE Class 10 Physics 2015 Solved Paper

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Question : 29
Total: 74
Find the equivalent resistance between points A and B.
Solution:  
Let 12Ω,6Ω and 4Ω are in parallel.
‌
1
Rp
‌
=‌
1
4
+‌
1
6
+‌
1
12

‌=‌
3+2+1
12
=‌
6
12
=‌
1
2

Rp‌=2Ω.
Now 2Ω,Rp and 5Ω are in series.
∵‌‌RAB‌=2+Rp+5=2+2+5
‌=9Ω.
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