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Magnetic force/field problem 
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#1
Dec407, 12:04 PM

P: 6

1. The problem statement, all variables and given/known data
A wire extends horizontally from east to west. The mass of its meter is (0.18)g and it carries a current of (1)A. If the wire is in a magnetic filed (0.5)T that heads horizontally upwards, determine the least current that makes the magnetic force equal the wire weight 2. Relevant equations F = BIl sin θ 3. The attempt at a solution at first i dont understand what does "heads horizontally upwards" means so this is where i end up: mg = BIl sin θ (0.18E3) x 10 = 0.5x1x1 sin θ θ = sin^1(1.8E3/0.5) θ = 0.2 


#2
Dec407, 01:36 PM

HW Helper
P: 6,202

I think horizontally upwards means perpendicular to the wire(direction of the current)



#3
Dec507, 11:22 PM

P: 6

You mean..
BIl = mg 0.5 I = 1.8E3 I = 0.0036 A ? 


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