A uniform magnetic field is directed out of the page. Because of the presence of

Question

A uniform magnetic field is directed out of the page. Because of the presence of a tenuous gas in the region, a charged particle moving in the plane of the page follows a clockwise spiral of decreasing radius as shown. (For each statement select T True, F False).

A) The magnetic force is doing exactly zero work on the charge at all times

B) The magnitude of the acceleration vector of the particle is constant.

C) The magnitude of the momentum of the particle is decreasing.

D) The charge is slowing down.

E) The charge is negative.

Explanation / Answer

(A)

TRUE

Force is perpendicular to the displacement.

And Work W = F.d

so, The magnetic force is doing exactly zero work on the charge at all times.

(B)

FALSE

The magnitude of the acceleration vector of the particle is not constant.

(C)

TRUE

As the speed is decreaseing,

The magnitude of the momentum of the particle is decreasing.

(D)

TRUE

The charge is slowing down.

(E)

FALSE

Charge is positive not negative.

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