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pt21 Phy 102 2010

# pt21 Phy 102 2010 - Physics 102 FORM 0[1 Positively charged...

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Physics 102 FORM 0 [1] Positively charged particles, moving horizontally along the northward direction with a distribution of velocities, enter a region of space where both an electric and a magnetic field are present. These particles are to be selected according to their velocities. If the electric field points to the west, in what direction must the magnetic field point so that particles of the chosen velocity are undeflected? (A])B should be vertical pointing up. [B] B should be vertical pointing down. [C] B should be horizontal pointing east. [D] B should be horizontal pointing west. [E] B should be zero. [2] A wire, 0.60 m in length, is carrying a current of 2.0 A and is placed at a certain angle with respect to the magnetic field of strength 0.30 T. If the wire experiences a force of 0.18 N, what angle does the wire make with respect to the magnetic field? [A] 20° [B] 25° (JCJ)30 0 [D] 35° [E] 60° [Sj Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the strength of the magnetic field midway between the two wires? [A] 1.0 x 10~ 5 T [B] 2.0 x 10~ 5 T [C] 3.0 x 10~ 5 T [D] 4.0 x 10^ 5 T (t%5.0 x 10~ 5 T [4] A constant magnetic field of 0.40 T is applied perpendicular to a rectangular loop of area 2.8 x 10~~ 3 m 2 . If the area of this loop changes from its

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pt21 Phy 102 2010 - Physics 102 FORM 0[1 Positively charged...

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