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Class 10 Science Medium Mcq English Medium

To obtain a total resistance of 4 ohm using three 6 ohm resistors, which arrangement should be used?

Question
To obtain a total resistance of 4 ohm using three 6 ohm resistors, which arrangement should be used?
All three in series
All three in parallel
Two in parallel, that combination in series with the third
Two in series, that combination in parallel with the third
Answer
Two in series, that combination in parallel with the third
Detailed Explanation
Two 6 ohm resistors in series give 12 ohm; this 12 ohm combination in parallel with the third 6 ohm resistor gives 1/(1/12+1/6) = 4 ohm.
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