The Cartesian coordinate representation of a Vector (65 cm/s, 32 cm/s), the polar coordinate of this vector are? A). (45 cm/s , 15 degrees)
B). (52 cm/s , 63 degrees)
C). (72 cm/s , 26 degrees)
D). (26 cm/s , 72 degrees)

Please show work

Find an expression for the electric field e⃗ at the center of the semicircle. hint: a small piece of arc length δs spans a small angle δθ=δs /r, where r is the radius. express your answer in terms of the variables q, l, unit vectors i^, j^, and appropriate constants.