1 0/3 In the lab, we have injected high speed electrons into a uniform magnetic

Question

1
0/3
In the lab, we have injected high speed electrons into a uniform magnetic field in a direction perpendicular to the magnetic field. Which of the following is correct about the interaction between the electrons and the magnetic field?

a.Because the Lorentz force slows down the electrons, the speed of the electrons decreases.
b.Because the electrons are injected in the direction perpendicular to the direction of the magnetic field, the magnitude of the Lorentz force is always zero.
c. Because the Lorentz force accelerates the electrons, the speed of the electrons increases.
d. None of the above.

2.
Magnetic Field in the center of a Helmhotz coil: B = 8NI

Explanation / Answer

1)

c. Because the Lorentz force accelerates the electrons, the speed of the electrons increases.

2)

b.0.0698 cm

3)

f. 2.236%

4)

0.154 amps

5)

a) To generate magnetic fields.

b)The radius of the electrons' orbit decreases.

c)The radius would increase by a factor of sqrt2.

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