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  4. A negative test charge is moving near a long straight wire carrying a current. The force acting on the test charge is parallel to the direction of the current. The motion of the charge is :

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Q. A negative test charge is moving near a long straight wire carrying a current. The force acting on the test charge is parallel to the direction of the current. The motion of the charge is :

JEE MainJEE Main 2017Moving Charges and Magnetism

Solution:

$\vec{F}=q\left(\vec{v}\times\vec{B}\right)$

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