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Physics Question 45 – NEET-UG 2023

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A wire carrying a current I along the positive x-axis has length L. It is kept in a magnetic field B→=(2i^+3j^−4k^) T. The magnitude of the magnetic force acting on the wire is :
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Ninja Strategy•Perpendicular Field Component

Recognize that only the magnetic field components perpendicular to the current (3j^ and −4k^) create a force, and their combined magnitude is 32+(−4)2=5.