The conducting rod a b shown in (Figure 1) makes frictionless contact with metal

Question

The conducting rod ab shown in (Figure 1) makes frictionless contact with metal rails ca and db. The apparatus is in a uniform magnetic field of 0.600 T, perpendicular to the plane of the figure.

Part C

If the resistance of the circuit abcd is a constant 3.50 , find the direction of the force required to keep the rod moving to the right with a constant speed of 8.00 m/s .

Part D

Find the magnitude of the force mentioned in Part C.

Express your answer in newtons to three significant figures.

I got Part A which is 2.4V I just need help on Part D

Explanation / Answer

c) force is directed towards right by usign right hand rule

d) f = Bil

emf = i*R

i = 2.4/3.5 = 0.69 amp

f = 0.6*0.69*0.5 = 0.207 N

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