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S13Phys2BaLec28C

A the magnitude of the force is largest when the

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Unformatted text preview: A) The magnitude of the force is largest when the particle is not moving. B) The force is zero if the particle moves perpendicular to the Feld. C) The magnitude of the force is largest when the particle moves parallel to the direction of the magnetic Feld. D) The force depends on the component of the particle’s velocity that is perpendicular to the Feld. E) The force acts in the direction of motion for a positively charged particle. Clicker Question 28C-1 Force on a Wire Consider a wire of length l with current I immersed in an external magnetic Feld, B. A magnetic force is exerted on each moving charge in the wire due to the magnetic Feld. The total force is the sum of all magnetic forces on all the individual charges producing the current. where θ is the angle between B and the direction of the current I along the length l . F = I B sin θ I X X X X X X B X X X X X X Force on a Wire If the current in a wire is moving downward and the magnetic Feld is into the board apply Right Hand Rule: Your positive current velocity points down (thumb) Your magnetic Feld points into the board (foreFnger). Middle Fnger then points to the right. ¡orce is to the right since current is deFned as positive charge moving. Force on a Wire If the wire is not straight or the magnetic Feld is not uniform, then you must break up the wire into small straight segments, d l ....
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A The magnitude of the force is largest when the particle...

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