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5/30 MCQs for:

Magnetism

A particle carrying a charge of +e travels in a circular path in a uniform magnetic field. If instead the particle carried a charge of +2e, the radius of the circular path would have been:

One-half the original radius.

Twice the original radius.

One-fourth the original radius.

Four times the original radius.

A charged particle moves with a constant speed through a region where a uniform magnetic field is present. If the magnetic field points straight upward, the magnetic force acting on this particle will be maximum when the particle moves:

In a plane parallel to the Earth's surface.

Upward at an angle of 45e above the horizontal.

Straight downward.

Straight upward.

A charged particle is observed traveling in a circular path in a uniform magnetic field. If the particle had been traveling twice as fast, the radius of the circular path would be:

One-fourth the original radius.

Four times the original radius.

One-half the original radius.

Twice the original radius.

An electric current produces:

An electromagnetic field.

A gravitational field.

A magnetic field.

An electric field.

An electron has an initial velocity to the south but is observed to curve upward as the result of a magnetic field. The direction of the magnetic field is:

Upward.

To the East.

Downward.

To the West.