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Card 8 / 9:
curl
the curl of vector field F = 〈 P , Q , R 〉 , denoted ∇ × F , is the “determinant” of the matrix | i j k ∂ ∂ x ∂ ∂ y ∂ ∂ z P Q R | and is given by the expression ( R y − Q z ) i + ( P z − R x ) j + ( Q x − P y ) k ; it measures the tendency of particles at a point to rotate about the axis that points in the direction of the curl at the point
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