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1. (10 points) A current produce a magnetic field of magnitude $5μT$ at distance $0.03m$ from a long, straight wire. What is the distance from the wire with this current where the magnitude of the magnetic field is $2μT$ ? 2. (10 points) An electron is accelerated through $2400V$ from rest and then enters a region where is a uniform 1.7 T magnetic field perpendicularly to it. What is the magnitude or magnetic force on the electron and the radius of the path? 3. (10 points) Flexible circular loop shown in $Fig$. $I$ has a radius,$−5cm$ and is in a magnetic field of strength $0.2T$ which is perpendicular to the plane. During the time $0.5s$ the loop is grasped at points A and B and stretched until its area is nearly zero. Find the average induced emf in the loop during that time and the current through the loop if its resistance is $2Ω$. 4. ( 10 points). Find the direction of the force on a positive charge for each diagram shown in Fig. 2, where $v$ is the velocity of the charge and $B$ is the direction of the magnetic field. ( $⊗$ means the vector points inward, $O$ means it points outward, toward you.) 5. (10 points) $A$ conducting rod $AB$ (Fig. 3) sliding with constant speed $v=2m/s$ on conducting rails in a uniform magnetic field with $B=0.15T$. The magnetic field is directed into the page as shown in Figure 3 . The rod has a length $L−0.5m$ and resistance $3Ω$. What is the current in the rod. Neglect a resistance of the rail.

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