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April 5th, 2015, 01:34 PM   #1
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Physics Help? How fast is the bar dropping?

A moving rod has a resistance of 0.25 ohms and moves on rails 20.0 cm apart. The stationary U-shaped conductor has negligible resistance. When a force of 0.350 N is applied to the rod, it moves to the right at a constant speed of 1.50 m/s. What is the magnetic field? (I know how to find this part out but need help with the second part of the question which is below)

Also, take B and everything else from the previous question and find out how fast the bar is dropping if v is constant. The mass of the bar is 125 g. And the space between the rails is 20.0 cm.

a) Draw FBD
b) Find v

Last edited by heather; April 5th, 2015 at 01:44 PM.
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April 7th, 2015, 04:45 AM   #2
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Is this the exact wording for the original question? If not, could you please post the exact wording with any diagrams (if there are any)? As it stands, the question isn't clear what is happening. Why should the bar drop? Was it pushed off the end of the conductor? Is it in free-fall or is it limited to motion only granted by the magnetic field?
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