1. A 20 cm long metal rod is pulled along two frictionless conducting rails at c

Question

1. A 20 cm long metal rod is pulled along two frictionless conducting rails at constant speed of 5 m/s. The rails have negligible resistance, and the rod has a resistance of 0.52 a) Calculate the current induced in the rod b) Is the current clockwise or counter clockwise? c) What is the direction of the force the magnetic field exerts onxx x the rod? d) Calculate the force the magnetic field exerts on the rod. How big is the force with which you have to pull the rod to move it at constant speed to the left? e Calculate the electrical power dissipated in the rod. f) Calculate the mechanical power put into moving the rod at constant speed. R-14T

Explanation / Answer

a) the induced emf in the rod is e = B l v sin 90 = B l v

i R = B l v

and current i = B l v / R

= 1.4 x 0.20 x 5 / 0.5 = 2.8A

b) Clockwise

c) Down

d) Force on the rod F = B i l sin 90 = 1.4 x 2.8 x 0.20 = 0.784N

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