Find the equivalent resistance between the points A and B:
Text Solution
Verified by ExpertsThe correct answer is:
B
The given circuit is redrawn as shown in the fig.
It is balanced Wheatstone bridge, therefore 10 Ω Ω resistance is ineffective. In the upper arm 4 Ω Ω and 8 Ω Ω are in series, their effective resistance is
R U = 4 + 8 = 12 Ω Ω
similarly, in the lower arm resistances 2 Ω Ω and 4 Ω Ω are also in series their effective resistance is
R L = 2 + 4 = 6 Ω Ω
Now, resistances R U and R L are in parallel. So, resultant resistant between points A and B is
R AB = 
= 
= 4 Ω Ω
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