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stryker123
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Homework Statement
A .2Kg metal rod carrying a current of 10A glides on two horizontal rails .5m apart. What vertical magnetic field is required to keep the rod moving at a constant speed if the coefficient of kinetic friction is .1?
Homework Equations
The Attempt at a Solution
F (magnetic) = B I L (B is vertical to L)
F (friction) = mew * mg
where mew = 0.1 =coeffi of friction
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BIL = 0.1 * 0.2*9.8
B = 0.1 * 0.2*9.8/10*0.5
B = 0.0392 Tesla vertically
acceleration of rod = m dv/dt = F (mag) - F (fric) = 0
dv/dt =0
v = constant
is this the right setup? or am I heading no where?