S13Phys2BaLec28C

# A the magnitude of the force is largest when the

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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 field. C) The magnitude of the force is largest when the particle moves parallel to the direction of the magnetic field. D) The force depends on the component of the particle’s velocity that is perpendicular to the field. E) The force acts in the direction of motion for a positively charged particle. Clicker Question 28C-1

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Force on a Wire Consider a wire of length l with current I immersed in an external magnetic field, B. A magnetic force is exerted on each moving charge in the wire due to the magnetic field. 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 field is into the board apply Right Hand Rule: Your positive current velocity points down (thumb) Your magnetic field points into the board (forefinger). Middle finger then points to the right. Force is to the right since current is defined as positive charge moving.

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Force on a Wire If the wire is not straight or the magnetic field is not uniform, then you must break up the wire into small straight segments, d l .
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