問題詳情

13. A conductor of radius r, length ℓ , and resistivity ρ has resistance R. It is melted down and formed into a new conductor, alsocylindrical, with one fourth the length of the original conductor. The resistance of the new conductor is .
(A) 5d06fe4e48bf2.jpgR
(B) 5d06fe58acc1b.jpgR
(C) R
(D) 4 R
(E) 16 R



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