Figure 29-35a shows an element of length ds ! 1.00 mm in a very long straight wire carrying current. The current in that element sets up a differential magnetic field at points in the surrounding space. Figure 29-35b gives the magnitude dB of the field for points 2.5 cm from the element, as a function of angle u between the wire and a straight line to the point. The vertical scale is set by dBs ! 60.0 pT. What is the magnitude of the magnetic field set up by the entire wire at perpendicular distance 2.5 cm from the wire?
Chapter 6: Surveys & Observation - NOT ON EXAM WEDNESDAY Today: - 3 types of research design claims (frequency, association, and causal) - Construct validity issue in self-report [survey design] - Survey design - Define each of the four major validities and know which are most relevant to what Designing self-reports Surveys & Polls - Method of posing questions to people - Typically about social/political opinions - Phone, interview, questionnaire,, or online… Open-ended format - Information rich - Hard to code; lengthy; resource heavy Forced-choice format - Much more familiar with - Limit response range - May limit way you can contextualize complex opinions - Easier to score TYPES o Mult