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Question

Question 5 (b)
What is the lowest total resistance that can be secured by combinations of four coils of resistance 4Ω,8Ω,12Ω and 24Ω?


Solution

(b) If these coils are connected in parallel, then the equivalent resistance will be the lowest.
When the resistances are connected in parallel ,the equivalent resistance is given by,
1R=1R1+1R2+1R3+1R4
=14+18+112+124=6+3+2+124=1224=12
R=2Ω
Therefore, 2Ω is the lowest total resistance.


Physics
NCERT Textbook
Standard X

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