Question 1. A charged non-magnetic particle is moving in a uniform magnetic fiel

Question

Question 1. A charged non-magnetic particle is moving in a uniform magnetic field. Which of the following conditions (if any) would cause the particle to speed up?

a. The velocity of the particle is at right angle to the magnetic field

b. The velocity of the particle is in the same direction as the magnetic field

c. The velocity of the particle is in the opposite direction as the magnetic field

d. answers (A-C) will cause the particle to speed up

e. None of the above, the magnetic force cannot cause the particle to speed up

Question 2. A loop of wire in a perpendicular magnetic field. Suddenly, the magnitude of the magnetic field begins to increase, what is the direction of the induced current in the loop?

a. clockwise

b.counter-clockwise

c. out of page

d. into the page

e. There is no induced current in the loop

Explanation / Answer

1.

as Magnetic force is always perpendicular to velocity of the charged particle

hence, the workdone by the force is always Zero and therefore, it can't change the Velocity of

the parrticle.

e. None of the above, the magnetic force cannot cause the particle to speed up

2.

as the field is increasing in magnitude , according to lenz law,

the magnetic field of induced current will oppose the increase in the magnetic field

and will produce a induced field oposite to the magetic field.

therefore,

current is

b.counter-clockwise

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