Two parallel, current-carrying wires with currents as shown. The wires are perpe

Question

Two parallel, current-carrying wires with currents as shown. The wires are perpendicular to the plane of the page and separated by a distance of 0.8 m. The force per unit length on each wire is closest to: a. 5.0 times 10^-5 N/m toward the other b. 1.5 times 10^-4 N/m toward the other c. 5.0 times 10^-5 N/m away from the other d. 1.5 times 10^-4 N/m away from the other A long solenoid (n = 1500 turns/m) has a cross-sectional area of 0.40 m^2 and a current given by l(t) = (4.0 + 3.0 t^2) A, where t is in seconds. A flat circular coil (N = 300 turns) with a cross-sectional area of 0.75 m^2 is outside and coaxial with the solenoid. What is the magnitude of emf induced in the outer coil at t = 2.0 s?

Explanation / Answer

(2) f= (uo/4pi) 2 i1 i2/r

f= (1x10-7) (2)(20)(30)/(0.8)

f=1.5x10-4 N/m

the wires carry currents in the opposite directions,so they repel each other . sothe force is away from the other

so f=1.5x10-4 N/m away from the other . so option d is correct

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