For the current carrying wire segments given below, which sections contribute to
ID: 1554038 • Letter: F
Question
For the current carrying wire segments given below, which sections contribute to the net magnetic field at point P on the diagram, and which segments contribute nothing at all. The directions of the arrows show the direction of current. a) 1 and 3 do contribute, 2 does not b) 2 does contribute, 1 and 3 do not c)1, 2, and 3 all contribute to the magnetic field at point P Circular Motion of Positive Particle: if a positive point charge is released into an existing magnetic field and as a result, travels around in a circular path, which of the following expressions correctly determines the radius of the orbit? a) R = mv/qB b) R = mv^2/qB c) R = mv/qB^2 Which of the following statements regarding Ampere's law is incorrect? a) Represents a closed integral over any chosen geometry In order to apply Ampere's Law all current have to be steady (i.e do not change with time) c) A useful law that relates the net magnetic field along a closed loop to the electric current passing through the loop In the figure below, a a freely-pivoting current-carrying wire loop is placed in an external magnetic field. The current flows clockwise, and the external magnetic field points towards +X axis. Which of the following statements is incorrect? a) the right side of the loop will be rotating towards the reader. b) The net force on the loop is zero the left side of the loop will be rotating towards the reader. Conservation of charge means: a) Polarity of electric charge is always conserved. b) Total amount of charge in a system is conserved. c) Neither of the above When a dielectric material is placed between charged plates of a capacitor, the polarization of the dielectric material produces a) a zero electric field b) an electric field opposing the field of the charges on the plate of the capacitor. c) an electric field in the same direction as the field of the charges on the plate of the capacitorExplanation / Answer
12) Answer: b
13) Answer: a
14) Answer: a, b, c
15) Answer: a
16) Answer: b
17) Answer: b