17 copper wires of length l and diameter d are connected in parallel to form a single composite conductor of resistance r. what is the ratio of the diameter of a single copper wire to d, if its length is also l and it has the same resistance?

Explanation:

As we know that resistance of one copper wire is given as

here we know that

now we have

now we know that such 17 resistors are connected in parallel so we have

Now if a single copper wire has same resistance then its diameter is D and it is given as

now from above two equations we have

now we have

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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