Physics

Problem

Questions 41-42 relate to the two long parallel wires shown. Initially the wires are a distance d apart and each has a current i directed into the page. The force per unit length on each wire has magnitude

\mathrm{F}_{\mathrm{o}}

42. The wires are moved apart to a separation 2d and the current in each wire is increased to 2i. The new force per unit length on each wire is (A)

\mathrm{F}_{0} / 4

(B)

\mathrm{F}_{\mathrm{o}} / 2

(C)

\mathrm{F}_{\mathrm{o}}

(D)

2 \mathrm{~F}_{\mathrm{o}}

(A)

\mathrm{F}_{0} / 4

(B)

\mathrm{F}_{\mathrm{o}} / 2

(C)

\mathrm{F}_{\mathrm{o}}

(D)

2 \mathrm{~F}_{\mathrm{o}}

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