An electron travels upward, and the magnetic field points to the right. In which

Question

An electron travels upward, and the magnetic field points to the right. In which direction is the magnetic force?

Answer

parallel to the velocity, so upward.

Perpendicular to the magnetic field and the velocity, and out of the paper.

parallel to the magnetic field, so to the right.

Perpendicular to the magnetic field and the velocity, and into the paper.

parallel to the velocity, so upward.

Perpendicular to the magnetic field and the velocity, and out of the paper.

parallel to the magnetic field, so to the right.

Perpendicular to the magnetic field and the velocity, and into the paper.

Explanation / Answer

as the magnetic force is given as

Force = q *(v X B)

v is upwards

magnetic field isto the right

v X B is into the page

as q is negative for electron

force is out of the paper

hence ,

Perpendicular to the magnetic field and the velocity, and out of the paper

Perpendicular to the magnetic field and the velocity, and out of the paper

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