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  4. As shown in the figure, a wire is bent to form a D-shaped loop, carrying current I, where the curved part is semicircle of radius R. the loop is placed in a uniform magnetic field vecB, which is directed into the plane of the paper. The magnetic force left by the closed loop is

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Q. As shown in the figure, a wire is bent to form a $D$-shaped loop, carrying current $I$, where the curved part is semicircle of radius $R$. the loop is placed in a uniform magnetic field $\vec{B}$, which is directed into the plane of the paper. The magnetic force left by the closed loop isPhysics Question Image

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Solution:

Zero (Net magnetic force on a closed current loop in a uniform $\vec{B}$ is zero)