Answer :
Equivalent resistance in arrangement A is 10 ohm as this is in series.
And in arrangement B both 10 ohm and 1000 ohm are in parallel.
So, combined resistance of arrangement B is caculated as follows:
1/R = 1/10 + 1/1000 = (100+1)/1000
R = 1000/101 = 9.9 ohm
So, arrangement in B has lower combined resistance.
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