In Fig. 21.8, take the half-cylinder?s radius and length to be 3.4 cm and 15 cm, respectively. If the electric field has magnitude 6.8 kN/C, find the flux through the half-cylinder. You don?t need to do an integral! Why not??

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(a) To find dP, form the product of the vector magnitudes E and dA and the cosine of 0: do = EdA cose, also written do = Ē•dà (b)