A charged particle is moving in a uniform circle in a B-field of radius r. How c

Question

A charged particle is moving in a uniform circle in a B-field of radius r. How can you decrease the radius of the circle in which it moves?

Question 3 options:

Reorient the B-field so that it's in the opposite direction from the particle's velocity.

Increase the velocity of the particle.

Increase the strength of the B-field.

Decrease the strength of the B-field.

Reorient the B-field so that it's in the same direction as the particle's velocity.

Decrease the velocity of the particle.

Reorient the B-field so that it's in the opposite direction from the particle's velocity.

Increase the velocity of the particle.

Increase the strength of the B-field.

Decrease the strength of the B-field.

Reorient the B-field so that it's in the same direction as the particle's velocity.

Decrease the velocity of the particle.

Explanation / Answer

Decrease the velocity of the particle.

the only way to make the particle rotate in a smaller circle is by decreasing its velocity. as B is perpendicular to moving particle it does no work on the particle , hence varying the strength of the B will not change the radius of particle. On the other hand if we change the direction of B particle will change its plane of rotation accordingly .

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