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20 May, 18:58

At which angle must a charged particle be moving to experience no magnetic force?

A. 180° to the magnetic field

B. 145° to the magnetic field

C. 45° to the magnetic field

D. 90° to the magnetic field

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  1. 20 May, 21:50
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    The correct option is (A) i. e. 180° to the magnetic field.

    Explanation:

    The magnetic force on a charged particle is given as: F = qvBsinФ

    B is the magnetic field.

    q is the charge on the particle.

    v is the velocity of the charged particle.

    Ф is the angle between magnetic field (B) & the velocity of charge (v).

    ⇒ F = qvb sin Ф

    When Ф = 180,

    & sin Ф = 0

    ⇒ F = 0

    therefore, there is no magnetic force when the magnetic field is parallel or anti-parallel to the velocity of the particle.
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