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  4. A conducting rod AB moves parallel to x -axis in a uniform magnetic field, pointing in the negative z -direction. The end A of the rod gets <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-uqjpzsvxfp2jqfyb.jpg />

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Q. A conducting rod $AB$ moves parallel to $x$ -axis in a uniform magnetic field, pointing in the negative $z$ -direction. The end $A$ of the rod gets
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NTA AbhyasNTA Abhyas 2022

Solution:

When the conducting rod $AB$ moves parallel to $x$ -axis in a uniform magnetic field pointing in the negative $z$ direction, then according to Fleming's left hand rule, the electrons will experience a force towards $B$ . Hence end $A$ will be positive.