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  4. A single current carrying loop of wire carrying current I flowing in anticlockwise direction seen from + ve z direction and lying in x y plane is shown in figure. The plot of hatj component of magnetic field (By) at a distance ' a ' (less than radius of the coil) and on y z plane vs z coordinate looks like

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Q. A single current carrying loop of wire carrying current I flowing in anticlockwise direction seen from + ve $z$ direction and lying in $x y$ plane is shown in figure. The plot of $\hat{j}$ component of magnetic field (By) at a distance ' $a$ ' (less than radius of the coil) and on $y z$ plane vs $z$ coordinate looks likePhysics Question Image

JEE MainJEE Main 2023Moving Charges and Magnetism

Solution:

image
$B _{ y }=0$ in plane of coil
$B_y$ is opposite of each other in $- z$ and $+ z$ positions.