Question

1)A particle moving to the right in a uniform magnetic field directed upwards experiences a magnetic...

1)A particle moving to the right in a uniform magnetic field directed upwards experiences a magnetic force directed inwards. The particle is

(A) positively charged.
(B) negatively charged.

(C) uncharged.
(D) Either A or B.

(E) Any of the above.

2) A charged particle moves in a uniform magnetic field which is perpendicular to the particle’s velocity. Which of the following statements is/are correct?

(A) The particle moves in a circle.

(B) The kinetic energy of the particle does not change since the magnetic force

does no work on the particle.

(C) The velocity of the particle is constant.

(D) Both A and B.

(E) All of the above.

3) The magnetic field of an electromagnetic wave traveling west oscillates vertically. The direction of oscillation of the electric field of this wave is

(A) up and down.
(B) east and west.

(C) north and south.

Science   Physics   
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Homework Answers

Answer #1

1) magnetic force is given as

From right hand rule, direction of v cross B is outward, therefore for F, to be inwards, q must be negative.

option 'B' is correct.

2) In magnetic field, speed of the particle does not get changed because magnetic force does no work.

And, in perpendicular direction, it moves in a circle.

Therefore, both A and B are correct.

Hence, correct option is 'D.

3) Electric and magnetic fields are perpendicular to each other in an electromagnetic wave and also these are perpendicular to wave direction.

Therefore, correct option is 'C.

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