both ans late (E) 7.39 (F) 9.62 (G) 12.6 OF LENGTH 20cM 8. In the diagram below,

Question

both

ans late (E) 7.39 (F) 9.62 (G) 12.6 OF LENGTH 20cM 8. In the diagram below, a conducting baris moving to the right on parallel conducting rails with speed v. The only resistance in the circuit is the 20.0 ohm resistor. The circuit is immersed in a uniform magnetic field B 2.00 T directed into the plane of the paper. At the instant that the resistor is dissipating electric energy at 50.0/s, what is v (in m/s)? we 5. pa (A) 79.1 (B) 90.0 (C) 65.4 (D) 118 (E) 47.6 (F) 133 (G) zero hin rod, 50.0 cm long, rotates with an angular speed of 12.0 rad/s about an axis through d and perpendicular to the rod. The plane of rotation of the rod is perpendicular to a 9. A t one en uniform magnetic field of magnitude 2.00 T. What is the magnitude of the electric field generated in the rod at a distance of 30.0 cm from the rotation axis (in V/m)? (A) 1.36 (B) 2.54 (C) 3.11 (D) 4.00 (E) 7.20 (F) 6.13 (G) 5.60

Explanation / Answer

8. P = 50 J/s

and P = I^2 R

50 = I^2 (20)

I = 1.58 A

and F = I L B = (1.58) (0.20)(2) = .632 N  

and P = F v

50 = F(0.632)

F = 79.1 m/s Ans(A)

9. E = B (w x)

E = (2 T) (12 x 0.30)

E = 7.20 V/m  

Ans(E)

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