week3 (dragged) 23

week3 (dragged) 23 - d Take section Its charge is d d dq =...

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d φ d φ dq = d φ 2 π Q E dq = k dq R 2 + z 2 = k d φ 2 π Q R 2 + z 2 E z,dq = E dq cos θ = k d φ 2 π Q R 2 + z 2 z R 2 + z 2 24 Take section Its charge is It produces E-field
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