ters 21, 22, 23 Question 12 of 18 View Policies Current Attempt in Progress In the figure a thin glass rod forms a semicircle of radius r = 5.13 cm. Charge is uniformly distributed along the rod, with +q = 4.09 pC in the upper half and -q = -4.09 pC in the lower half. What is the magnitude of the electric field at P, the center of the semicircle? Number Units Save for Later Attempts: 0 of 1 used Submit