Problem 3. (4 points) Sliding-bar apparatus. Consider the arrangement shown in F

Question

Problem 3. (4 points) Sliding-bar apparatus. Consider the arrangement shown in Fig. 3. Assume that R1 = 6 , R2 = 3 , l = 1.2 m, and a uniform 2.5-T magnetic field is directed into the page. At what speed should the bar be moved to produce a current of 3 A on the bar?

Problem 3. (4 points) Sliding-bar apparatus. Consider the arrangement shown in Fig. 3. Assume that R1 = 6 0, R = 30, 1 = 1.2 m, and a uniform 2.5-T magnetic field is directed into X X X X X X the page. At what speed should the bar be Rs a Ry moved to produce a current of 3A on the bar? (A) 0.5 m/s (B) 2 m/s xxx (C)4 m/s (D) 6 m/s Figure 3. Sliding-bar apparatus.

Explanation / Answer

Req = 1/(1/3+1/6)
= 2 Ohm

I = E/R
= -lvB/R

=> v = IR/lB
=> v = (3*2)/(1.2*2.5)
=> v = 2 m/s

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