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# (Solved): andwer6 5. (10 points) A conducting rod AB (Fig. 3) sliding with constant speed v=2m/s on conducti ...

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5. (10 points) A conducting rod AB (Fig. 3) sliding with constant speed on conducting rails in a uniform magnetic field with . The magnetic field is directed into the page as shown in Figure 3. The rod has a length and resistance . What is the current in the rod. Neglect a resistance of the rail. 6. ( 10 points) Consider the three long, straight parallel wires shown in Figure 5. Find the magnetic field in the middle point between wire 2 and wire 3 7. ( 10 points) Consider the three long, straight parallel wires shown in Figure 5 . Find the magnetic field at point that is left frotn wire 1. 8. ( 10 points) Find the equivalent resistance between points and and current and voltage at each resistance in Fig. 7 if potential drop between points a and is . 9. ( 10 points) Find the equivalent resistance between points and and total current in circuit in Fig. 8 if potential drop between points and is . 10. ( 10 points) is applied to the resistance . What is the current through the resistance? Extra Credit ( 10 points) A thin metal rod with mass rest on but not attached to, two metal supports in a uniform 0.45 magnetic field as shown in Fig 6. A battery and a resistor are connected to supports. What should be voltage of the battery that will not break the circuit at the support?

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