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# The long, straight wire shown in Fig. we saw earlier carries constant current $l$. A metal bar with length $L$ is moving at constant velocity $\overrightarrow{\boldsymbol{v}}$, as shown in the figure. Point $a$ is a distance $d$ from the wire. If the bar is replaced by a rectangular wire loop of resistance $R$, what is the magnitude of the current induced in the loop?

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c) Now if we replace the bar with a loop with a width of $W$ and length of $L$ as shown in the following figure. The induced emf in the loop is,

$\mathcal{E}=-\frac{d\Phi_{B}}{dt}$

where $\Phi_{B}=BA$. As we move parallel to the wire, the magnetic field is constant, so,

$\frac{d\Phi_{B}}{dt}=0$

hence,

$\mathcal{E}=0$

therefore,

$\boxed{I=0}$

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