In (Figure 1), the rod moves with a speed of 1.6 m/s on rails 30.0 cm apart. The

Question

In (Figure 1), the rod moves with a speed of 1.6 m/s on rails 30.0 cm apart. The rod has a resistance of 2.9 Ohm. The magnetic field is 0.35 T, and the resistance of the U-shaped conductor is 24.0 Ohm, at a given instant. Calculate the induced emf. Express your answer to two significant figures and include the appropriate units. Calculate the current in the U-shaped conductor. Express your answer to two significant figures and include the appropriate units. Calculate the external force needed to keep the rod's velocity constant at that instant. Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

a) =Blv

= Blv = .35 * .3 * 1.6 = .17 V

b) I=/R

I = .168 / (24 + 2.9) = .0062 = 6.2 mA

c) F = IlB
= .0062 * .3 * .35 = .000651 = 6.5*10^-4 N

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