Let us consider a copper wire having radius r and length l. Let its resistance be R. If the radius of another copper wire is 2r and the length is l/2 then the resistance of this wire will be

NDA 2019 Physics question

Let us consider a copper wire having radius and length . Let its resistance be . If the radius of another copper wire is and the length is then the resistance of this wire will be

(A)
(B)
(C)
(D)Correct

Answer: (D)

Solution

. For the second wire, \dfrac${ρ

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Question ID VK-031321