The lightbulb in the circuit shown in the figure ( Figure 1 ) has a resistance o

Question

The lightbulb in the circuit shown in the figure(Figure 1)has a resistance of 11? and consumes 4.3W of power; the rod is 1.35m long and moves to the left with a constant speed of 3.3m/s

. The strength of the magnetic field is 1.5T .

The lightbulb in the circuit shown in the figure(Figure 1)has a resistance of 11? and consumes 4.3W of power; the rod is 1.35m long and moves to the left with a constant speed of 3.3m/s The strength of the magnetic field is 1.5T. Find the current that flows in the circuit. Express your answer using two significant figures. I = ?A What speed must the rod have if the current in the circuit is to be 1.4A ? Express your answer using two significant figures. v = ?m/s

Explanation / Answer

a)

P=I^2*R

=>I=sqrt[P/R]

I=sqrt[4.3/11]

I=0.6252 A

b)

E=IR =1.4*11

E=15.4 V

E=BLv

=>v=E/BL =15.4/1.5*1.35

v=7.6 m/s

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