Problem 27.24a positively charged particle is at rest on the positive z axis in reference frame s. reference frame sâ² is moving along the positive x axis of s, reference frame sâ²â² is moving along the negative x axis, and reference frame sâ²â²â² is moving along the y axis, all with speed v relative to s. the axes of all the reference frames are oriented the same way, and their origins coincide at instant t = 0, when observers in each reference frame make measurements. part ain which reference frames do observers measure an electric field? check all that apply. check all that apply. ssâ²sâ²â²sâ²â²â²