HI EVEYONE,
NEED TO TAALK TO SOMEONE WHO IS UP ON CALCULATING THE VALUE OF (B), REQUIRED TO LIFT A PLATE OF XXNEWTONS. ALSO ESTIMATE THE M.M.F REQUIREDTO LIFT THE SAME PLATE.
THANKS

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 Mentor No need to yell. What are the equations that describe the force generated by current flowing in a coil?
 I WILL TRY EXPLAIN MY QUESTION AND PRESENT YOU WITH ALL THE FACTS I HAVE AT MY DISPOSAL. In the question it is first mentioned that the pull,P, exerted at each pole of the magnet is given by the equation: P = Bsquared x A divided by 2 x permeability of free space. A being CSA of the pole faces free space being 4 x pie x 10 to power of -7. OK. next we have c.s.a of magnet: 22 x 22 cm. R, radius: 0.5m. angle in degrees: 120. relative permeability of magnet: 2000. relative permeability of plate: 1000. thickness of plate: 5cm weight of plate: 10'000 Newtons. I have drawn out a diagram to show you what the radius and angle are all about. Can i paste a paint document here? It would help a lot. Many thanks .

 Blog Entries: 2 Recognitions: Homework Help Science Advisor Can you define more clearly, the units for each of the variables in your expression $$P = \frac{B^2 A}{2 \mu_o}$$ by the way, your expression looks similar to one I note on this page. Are you using the same units? From your given information, I don't see a value for "magnetic flux density" B. Perhaps you have some given information from which you can derive B.