Find the equivalent resistance across terminal a - b: 

F1 Engineering Arbaz 29-12-23 D16

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SSC JE Electrical 9 Oct 2023 Shift 3 Official Paper-I
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  1. 20Ω
  2. 14Ω
  3. 28Ω
  4. 7Ω

Answer (Detailed Solution Below)

Option 4 : 7Ω
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Detailed Solution

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The simplified equivalent circuit is:

F1 Engineering Arbaz 29-12-23 D17

 

10Ω and 15Ω are in parallel.

\(R={15\times 10\over 15+10}=6\space Ω\)

6Ω and 8Ω are in series.

R = 6+8 = 14 Ω 

When two equal resistances are connected in parallel, their equivalent resistance is always the half of resistance.

\(R_{ab}={14\over 2}=7\Omega\)

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