In a question, what does it mean by "The magnetic force on an element dr of the wire is Idr × B where B is the magnetic field at r." ? How does it affect the evaluation?

a) what is the magnitude of the magnetic field produced at origin ? b) what is the magnitude of magnetic force that q` exerted on q?

(Figure 1) shows a mass spectrometer, an analytical instrument used to identify the various molecules in a sample by measuring their charge-to- mass ratio q/m. The sample is ionized, the positive ions are accelerated (starting from rest) through a potential difference AV, and they then enter a region of uniform magnetic field. The field bends the ions into circular trajectories, but after just half a circle they either strike the wall or pass through a small opening to a detector. As the accelerating voltage is slowly increased, different ions reach the detector and are measured. Consider a mass spectrometer with a 200.00 mT magnetic field and an 8.0000 cm spacing between the entrance and exit holes. igure + AV d Detector Part A To five significant figures, what accelerating potential difference AV is required to detect the ion O,? The masses of the atoms are shown in the table; the mass of the missing electron is less than 0.001 u and is not relevant at this level of precision. Use…

(L10) In a lab at UTD, a straight vertical long wire carries a current of 5.25 A downward (pointing towards the floor). A uniform 0.488 T magnetic field is applied from the south to the north through the wire. What is the magnetic force on a 1.27 m section of the wire (in N; use positive sign if the force points eastward and negative sign if the force points westward)?