18.As the circuit shown in Fig. 3, find the current passing through the 9-V voltage source. (A) ↓ , 0.56 A (B) ↑ , 0.36 A (C) ↓ , 0.25 A (D) ↑ , 0.16 A

1.In the figure shown on the right, a wire is extended from y = -(a+L) to y = a+L and is bent as a semicircle in the xy plane. If the wire carries a current I flowing along the direction indicated by the arrows and the magnetic flux density B in the region is along the +z direction, determine the magnetic force acting on the semicircular arc with the following parameters: I = 2 A, B = 5 T, a = 1 m, L = 2 m. (A) 10 Nt (B) 20 Nt (C) 30 Nt (D) 40 Nt (E) 5 Nt

18.As the circuit shown in Fig. 3, find the current passing through the 9-V voltage source.

(A) ↓ , 0.56 A
(B) ↑ , 0.36 A
(C) ↓ , 0.25 A
(D) ↑ , 0.16 A

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