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

5. (10 points) A conducting rod AB (Fig. 3) sliding with constant speed $\mathrm{v}=2\mathrm{m}/\mathrm{s}$ on conducting rails in a uniform magnetic field with $B=0.15\mathrm{T}$. The magnetic field is directed into the page as shown in Figure 3. The rod has a length $L=0.5\mathrm{m}$ and resistance $3\Omega$. 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 $1\mathrm{cm}$ left frotn wire 1. 8. ( 10 points) Find the equivalent resistance between points $a$ and $b$ and current and voltage at each resistance in Fig. 7 if potential drop between points a and $b$ is $12\mathrm{V}$. 9. ( 10 points) Find the equivalent resistance between points $a$ and $b$ and total current in circuit in Fig. 8 if potential drop between points $a$ and $b$ is $12\mathrm{V}$. 10. ( 10 points) $10\mathrm{V}$ is applied to the resistance $5\Omega$. What is the current through the resistance? Extra Credit ( 10 points) A thin $0.5\mathrm{m}$ metal rod with mass $0.75\mathrm{kg}$ rest on but not attached to, two metal supports in a uniform 0.45 $T$ magnetic field as shown in Fig 6. A battery and a resistor $R=25\Omega$ are connected to supports. What should be voltage of the battery that will not break the circuit at the support?