# A 0.200 - kg metal rod carrying a current of 10.0 A glides on twohorizontal rails 0.500 m apart. What vertical magnetic field isrequired to keep the rod moving at a constant speed if the coefficientof kinetic friction between the rod and rails is 0.100?

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A 0.200 - kg metal rod carrying a current of 10.0 A glides on two
horizontal rails 0.500 m apart. What vertical magnetic field is
required to keep the rod moving at a constant speed if the coefficient
of kinetic friction between the rod and rails is 0.100?

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Step 1

Given data:

Mass of the metal rod, m =0.200 kg

Current in the rod, I = 10.0 A

Separation between the rod, L = 0.500 m

Coefficient of kinetic friction = 0.100

Step 2

In order to move the rod, the kinetic friction would ...

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