1 A) north pole to south pole through the magnet B) in a circle around the entire magnet, while never touching the magnet C) south pole to north pole outside the magnet D) north pole to south pole outside the magnet 2 A) it becomes demagnetized B) you get a separate south pole and a separate north pole C) you get monopoles D) you get two magnets 3 A) scattered B) aligned C) misaligned D) random 4 A) direction of current B) direction of magnetic force C) direction of the magnetic field D) amount of current 5 Which of the following phenomena is NOT illustrated in Figure 24-9?
<![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617932/nr.JPG','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (10.0K)</a>]]> A) A current causes a magnetic field. B) The magnetic field caused by a wire is stronger closer to the wire. C) Magnetic field lines form closed loops. D) In space, magnetic field lines point from north to south. 6 A) Send a current through the bar. B) Spin the bar over the wire as a current runs through it. C) Wrap the wire around the bar, and send a current through it. D) Attach the wire to either end of the bar, and send a current through it. 7 A) it remains the same B) it remains the same C) it is reduced D) it increases 8 A) melt B) generate an electric current C) demagnetize the magnet D) become polarized 9 A) attract B) ignore C) destroy D) repel 10 A) have switched over the years B) have only recently appeared C) have remained the same D) have remained the same 11 A) magnetic flux per unit area B) magnetic flux C) mass of the magnet D) size of the magnet 12 A) 0.05 N B) 0.5 N C) 50 N D) 5 N 13 In the figure below, if the magnetic poles were reversed AND the current in the wire were reversed, what would the direction of the magnetic force be?
<![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617932/ns.JPG','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (5.0K)</a>]]> A) up B) down C) left D) right 14 A) They stop carrying current because the current directions cancel each other out. B) Nothing happens. C) They repel each other. D) They attract each other. 15 A) away from you B) to your left C) to your right D) toward you 16 A) only electrons B) all charged particles, regardless of size C) only protons D) only small particles 17 -2 T. The beam of electrons is perpendicular to the field. How strong is the force acting on each proton?A) -6.4×10-14 N B) 1.6×10-12 N C) 3.2×10-14 N D) 3.2×10-12 N 18 A) resistance B) direction of the north pole C) current D) voltage 19 A) galvanometer B) ohmmeter C) ammeter D) voltmeter 20 A) A galvanometer changes the direction. B) As the split ring reaches vertical, each half of the ring switches brushes and reverses the direction of current in the wire loop. C) A magnet moves through an electrical field. D) A wire spins the wheel. 21 In the figure below, if the magnetic poles were reversed, what would the direction of the magnetic force be?
<![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617932/ns.JPG','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (5.0K)</a>]]> A) right B) down C) up D) left 22 A) 0.16 m B) 0.11 m C) 2.3 m D) 3.3 m 23 7 m/s travels through a uniform magnetic field of 1.4 T at right angles to the field. How strong is the force that acts on the electron?A) -1.3×10-11 N B) -3.7×10-11 N C) 1.5×10-11 N D) 2.2×10-11 N 24 If there were no current in the wire in the figure below, what impact, if any, would that have on the magnetic force shown?
<![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617932/ns.JPG','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (5.0K)</a>]]> A) The force would remain the same. B) The force would be directed toward the south pole shown. C) The force would be directed toward the south pole shown. D) The force would be reduced, but still point upwards. 25 A) in the same direction as B) opposite of C) parallel to D) perpendicular to 26 A) toward you B) counterclockwise C) away from you D) clockwise 27 A) so small it cannot be measured B) opposite the direction indicated by the third right hand rule C) in the same direction as the magnetic field D) in the same direction as indicated by the third right hand rule 28 In the figure below, if the current in the wire were reversed, what would the direction of the magnetic force be?
<![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617932/ns.JPG','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (5.0K)</a>]]> A) down B) left C) right D) up 29 A) 0.064 A B) 3.3 A C) 0.13 A D) 1.7 A
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