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What is (i) the highest, (ii) the lowest total resistance that can be secured by combinations of four coils of resistance 4Ω, 8Ω, 12Ω, 24Ω?

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What is (i) the highest, (ii) the lowest total resistance that can be secured by combinations of four coils of resistance 4Ω, 8Ω, 12Ω, 24Ω?

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(i) The highest can be secured by series combination and is equal to

R=4Ω+8Ω+12Ω+24Ω=48Ω

(ii) The lowest total resistance can be secured by parallel combination, which is given by

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