Physics

Physics

Problem

15. A wire of length

L

and radius

r

has a resistance

R

. What is the resistance of a second wire made from the same material that has a length

L / 2

and a radius

r / 2

? (A)

4 R

(B)

2 R

(C)

R

(D)

R / 2

(A)

4 R

(B)

2 R

(C)

R

(D)

R / 2

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