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Consult Interactive Solution 21.51 to see how this problem can be solved. A coil rotating perpendicularly...

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Physics

Consult Interactive Solution 21.51 to see how this problem canbe solved. A coil rotating perpendicularly to a uniform magneticfield contains 340 turns and has an area per turn of 3.0 ×10-3 m2. The magnetic field is 0.18 T, andthe current in the coil is 0.15 A. A brake shoe is pressedperpendicularly against the shaft to keep the coil from turning.The coefficient of static friction between the shaft and the brakeshoe is 0.79. The radius of the shaft is 0.0077 m. What is themagnitude of the minimum normal force that the brake shoe exerts onthe shaft?

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