12. /1.5 points CJ10 21 P030. My Notes Ask Your Teache At New York City, the ear

Question

12. /1.5 points CJ10 21 P030. My Notes Ask Your Teache At New York City, the earth's magnetic field has a vertical component of 5.2 10-5 T that points downward (perpendicular to the ground) and a horizontal component of 1.8 10-5 T that points toward geographic north (parallel to the ground). What is the magnitude and direction of the magnetic force on a 12.0 m long, straight wire that carries a current of 11 A perpendicularly out of the ground? magnitude directionSelect- Additional Materials Section 21.5

Explanation / Answer

Magnetic force (F) on the vertical wire is given by ..
F = Bh * i * L .. (Bh = field horiz.component, i=current, L=wire length)
F = (1.80*10^-5T)(11A)(12m) .. .. F = 2.376*10^-3N

Finding force direction using Fleming's right-hand rule ..
(first finger for B points North, second finger for current points upward .. thumb indicates East for force direction)

F = 2.376*10^-3N, East

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