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Magnetism Challenge If an iron bar is placed in a magnetic field, which one of the figures represents the distortion of the field? Ans. a What is the strength of the B-field at point P? Ans. 4.8 x 10-5 T What is the direction of the B-field at point P? Ans. Out of screen Electrons flow along a wire directed out of the page. What is the direction of the magnetic force on the wire? Ans. down What is the magnitude of the B-field at point P, if the current is 1 A? Ans. 5 x 10-6 T Which diagram shows the correct magnetic field around the wire? Ans. A (careful it is showing electron flow) Which one is the correct representation? Ans. A Which one is correct? Ans. C When the switches are closed will these two bars attract or repel? Ans. attract Which is correct? Ans. B and D What is the correct polarity on the paper clips? Ans. D Where is the North pole? Ans. C (ignore current arrows – look at +, - to determine current flow) What is the direction of the magnetic field at the center of the loop? Ans. Into screen Where is the South pole? Ans. D What happens to the strength of the field if the resistance decreases? Ans. strengthens What is the resistance? Where is the North pole? Ans. 8 ; D What is the direction of the magnetic force on the segment AB? Ans. Out of screen What is the direction of electron flow in the wire? Ans. Down wire from B to A What is the direction of the current in the coil? Ans. Down in front Where is the field strongest? Ans. C What is the pole at K? Ans. N What is the force on segment bc? (magnitude and direction) Ans. 0.03 Newtons (assume 1 A current); directed into screen If this wire were made from a loose chain, would it expand to form a circle, compact to a point, or nothing? Ans. compact Which shows the correct electric field around a negative charge? Ans. D Which is correct? Ans. C Which shows the correct magnetic field around a positive current moving into the board? Ans. A