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A conductor lies along the $z$-axis at $-1.5 \leq z \leq 1.5\;m $ and carries a fixed current of $10.0\;A$ in $-a_{z}$ direction (see figure). For a field $\bar{B}=3.0 \times 10^{-4} e^{-0.2x} \hat a_y\;T$. Find the power required to move the conductor at constant speed to $x = 2.0m, y = 0\;m\;in\; 5 \times 10–3\; s$. Assume parallel motion along the $x$-axis.

$\begin{array}{1 1}(A)\;14.85\;W \\ (B)\;29.7\;W \\(C)\;1.57\;W \\(D)\;2.97\;W \end{array} $

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Parallel motion along the $x$-axis $2.97\;W $
Hence D is the correct answer.
answered Apr 7, 2014 by meena.p

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