question archive The metal equilateral triangle in the diagram above, 22

The metal equilateral triangle in the diagram above, 22

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The metal equilateral triangle in the diagram above, 22.8 cm on a side, is halfway into a 0.574 T magnetic field. What is the magnetic flux (in Wb) through the triangle?

I used flux equals ABcos(60) and got 64.6 and thought I could maybe halve it to get 32.3 but it says both are wrong?

pur-new-sol

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the area of half the triangle is 1/2 (1/2) (0.228)2 sin60 = 0.01125 m2

so φ = 0.01125 (0.574) = 6.46 x 10-3 wb

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