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Question is attached in the image (ALTS-7 Q16) What is the role,if any, of the line joining DC??

Question is attached in the image (ALTS-7 Q16)
 
What is the role,if any, of the line joining DC??

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Grade:12th pass

1 Answers

Eshan
askIITians Faculty 2095 Points
5 years ago
Dear student,

When switch is open, the resistor across AD is in parallel to resistor AC; and that across BD is parallel to BC, and both of them are in series.

Hence the net resistance=\dfrac{(6)(12)}{6+12}\Omega+\dfrac{(6)(12)}{6+12}\Omega=4\Omega+4\Omega=8\Omega

When switch is closed, the8\Omegacomes in parallel to the above net resistance and the new net resistance becomes4\Omega.

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