Wearing a silver bracelet in an area with a high magnetic field is risky because of what?

13. You have the apparatus shown in Figure P21.13. A circular metal plate swings past the north pole of a permanent magnet. The metal consists of a series of rings of in- creasing radius. Indicate the direction of the current in one ring (a) as the metal swings down from the left into the magnet- ic field and (b) as the metal swings up to- ward the right out of the magnetic field. Use Lenz's law to justify your answers. Figure P21.13 Metal plate Magnet N

A magnet can exert a force on a moving charged particle, but it cannot change the particle’s kinetic energy. Why not?

What is the acceleration of a proton moving with a speed of 7.5 (m/s) parallel to a magnetic field of 1.4 (T)?

9. Integrated Concepts & Review (a) A 0.140-kg baseball, pitched at 40.0 m/s horizontally and perpendicular to the Earth’shorizontalB= 5.0×10^−5 T field, has a 100-nC charge on it. What distance is it deflectedfrom its path by the magnetic force, after traveling 30.0 m horizontally? (b) Would you suggest this as a secret technique for a pitcher to throw curve balls?