20 - Review I - PHYS Fall 2009 Review I Schedule • Monday...

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Unformatted text preview: PHYS Fall 2009 Review I 10/12/09 Schedule • Monday • Magnetic Concepts, HW problems • Wednesday • Magnetic Concepts, HW problems • Review of Earlier Material Field and Force A positive charge moves parallel to a wire. If a current is suddenly turned on, which direction will the force act? z y x I + q 1) + z (out of page) 2) - z (into page) 3) + x 4) - x 5) - y Magnetic Force on a Wire A horizontal wire carries a current and is in a vertical magnetic feld. What is the direction o¡ the ¡orce on the wire? 1) le¡t 2) right 3) zero 4) into the page 5) out o¡ the page B I Magnetic Field of a Wire If the currents in these wires have the same magnitude, but opposite directions, what is the direction of the magnetic ¡eld at point P? 1) direction 1 2) direction 2 3) direction 3 4) direction 4 5) the B ¡eld is zero P 2 3 4 Two Long Wires Two long straight parallel wires, separated by 0.80 cm, are perpendicular to the plane of the page as shown in the Fgure. Wire 1 carries a current of 10.5 A into the page. What must be the current (magnitude and direction) in wire 2 for the resultant carries a current of 10....
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20 - Review I - PHYS Fall 2009 Review I Schedule • Monday...

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