How Does a Hard Disc Drive's Magnetic Field Affect an Electron's Motion?

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SUMMARY

The discussion focuses on calculating the Lorentz force acting on an electron near the edge of a hard disk drive (HDD) with a magnetic field strength of 95 mT and a rotational speed of 7200 RPM. The participant attempted to use the equations for velocity and centripetal force but arrived at an unrealistic result of 4.6 x 10^-34 Newtons for the Lorentz force. The need for clarification on the correct formula for Lorentz force, which is F = q(v x B), is emphasized to accurately determine the force exerted on the electron.

PREREQUISITES
  • Understanding of Lorentz force and its formula (F = q(v x B))
  • Basic knowledge of magnetic fields and their effects on charged particles
  • Familiarity with rotational motion and centripetal force equations
  • Ability to convert units, specifically RPM to linear velocity
NEXT STEPS
  • Research the Lorentz force and its applications in electromagnetic theory
  • Learn about the conversion of RPM to linear velocity in circular motion
  • Study the effects of magnetic fields on charged particles in various contexts
  • Explore the principles of hard disk drive operation and data storage technology
USEFUL FOR

Students in physics or engineering, electronics enthusiasts, and anyone interested in the principles of electromagnetism and data storage technologies.

Zimtstange
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Homework Statement


I don't quite understand the following question, i get a very unrealistic result...

The write head of a hard disc drive produces a magnetic field of 95mT. The disc has a radius of 3.5 inches and rotates at 7200 rpm (rotations per minute). Calculate the Lorentz force acting on an electron near the edge of the disc.
Compare the result to the electron's weight.

Homework Equations



f = v/(2*\prod*r)

F= (m*v^2)/r

The Attempt at a Solution



i tried to solve it with this two equations but i got 4.6 * 10^-34 Newton for the Lorentzforce... :confused:

can somebody help me?
 
Physics news on Phys.org
What's the formula for Lorentz force? (The force a magnetic field exerts on a moving charge.)
 

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