Of the listed scenarios, which particle feels a net magnetic force acting upon i

Question

Of the listed scenarios, which particle feels a net magnetic force acting upon it?

A charged particle moving in the +x-direction in a uniform magnetic field directed in the +x-direction.

A neutral particle moving in the +y-direction in a uniform magnetic field directed in the +x-direction.

A charged particle at rest in a uniform magnetic field directed in the +x-direction.

A particle of magnetized iron oriented with the north pole in the +y-direction at rest in a uniform magnetic field directed in the +x-direction.

A charged particle moving in the +x-direction in a uniform electric field directed in the +x-direction.

Explanation / Answer

(1)

There is no magnetic force exerted on the particle when it moves in the +x-direction in a uniform magnetic field directed in the +x-direction. The angle between field and the velocity is zero degrees. So, the magnetic force on the particle is zero [F= Bvqsin0o = 0].

(2)

There is no magnetic force exerted on any neutral particle. This partilce moves in a straight line path only in a magnetic field.

(3)

If the charged particle is at rest position, the acceleration of the particle is zero. So, there is no magnetic force exerted on this particle.

(4)

The force exerted on the magnetized iron rod.

(5)

The magnetic force is only zero when a charged particle moves in the +x-direction in a uniform electric field directed in the +x-direction. But, the electrostatic force may exerted on the charged particle.

        F = q [E + vxB] = q [E + 0] = qE

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