(a) The highest resistance can be secured (or obtained) by connecting all the four coils in series. In this case:
R = R1 + R2 + R3 + R4
R = 4 + 8 + 12 + 24
R = 48
Thus, the highest resistance which can be secured is 48 ohms.
(b) The lowest resistance can be secured by connecting all the four coils in parallel. In this case:
Thus, the lowest resistance which can be secured is 2
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