problem21_94

# University Physics with Modern Physics with Mastering Physics (11th Edition)

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21.94: The electric field in the x -direction cancels the left and right halves of the semicircle. The remaining y -component points in the negative y -direction. The charge per unit length of the semicircle is:
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Unformatted text preview: . sin λ sin but λ λ and λ 2 a dθ θ k θ dE dE a dθ k a dl k dE πa Q y = = = = = So, ∫ = = θ-= = 2 2 2 . downward , 2 λ 2 ] cos [ λ 2 sin λ 2 π π y πa kQ a k a k dθ θ a k E...
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• Electric charge, negative y-direction, right halves, y-component points

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