Exit ticket- moving charged in field

A particle carrying a charge of +e travels in a circular path in a uniform magnetic field. If instead the particle carried a charge of +2e, the radius of the circular path would have been ____.

• twice the original radius

• four times the original radius

• the same as the original radius

• one-half the original radius

• one-fourth the original radius

A stationary proton is in a uniform magnetic field of 0.20 T. What is the magnitude of the magnetic force on the proton?

• zero

• 1.6 × 10^-21 𝑁

• 3.2 × 10^-21 𝑁

• 1.6 × 10^-20 𝑁

• 3.2 × 10^-20 𝑁

A proton travels at a speed of 5.0 × 10⁷ 𝑚/𝑠 through a 1.0 𝑇 magnetic field. What is the magnitude of the magnetic force which acts on the proton if the angle between the proton's velocity and the magnetic field vector is 30°?

• 2.0×10^-14 𝑁

• 4.0×10^-14 𝑁

• 2.0×10^-12 𝑁

• 4.0×10^-12 𝑁

• 6.0×10^-12 𝑁

A charged particle of mass 𝑚 is exposed to a constant magnetic field of magnitude 𝐵 and directed out of the page, in which the particle moves in a clockwise circle of radius 𝑅 with a speed 𝑣, as shown below.

In a separate experiment, the same particle is traveling with a speed 2𝑣 in a constant magnetic field of the same magnitude 𝐵, now directed into the page. Which of the following statements is true?

• Now the particle travels in a clockwise circle of radius R

• Now the particle travels in a counterclockwise circle of radius R

• Now the particle travels in a counterclockwise circle of radius 2R

• Now the particle travels in a clockwise circle of radius R/2

• Now the particle travels in a counterclockwise circle of radius R/2

A beam of electrons has speed 10⁷ 𝑚/𝑠. It is desired to use the magnetic field of the Earth,

5 × 10^-5 𝑇, to bend the electron beam into a circle. What will the radius of this circle be?

• 1 nm

• 1 μm

• 1 mm

• 1 m

• 1 km

Four small particles are seen moving through an area with the magnetic field going out of the page. Which of the following statements is consistent with the diagram?

• All the particles are positively charges but have different mass

• All the particles have same mass, but different charges

• Two particles are positive while one is negative

• Two particles are negative while one is positive

• You can only ascertain that all are charged

Tags

Moving charge

Describe the direction the charge gets deflected at in the diagram above

• up

• down

• left

• right

Tags

Moving charge

Describe the direction the charge gets deflected at in the diagram above

• out of the page

• into the page

• left

• right

A 5 C charge moving at 3 m/s toward the right of the page encounters an unknown magnetic field. The charge experiences a force of 30 N upwards. What is the magnetic field strength on the charge?

• 450 T right

• 2.0 T out of the page

• 2.0 T into the page

• 450 T left

Three particles travel through a region of space

where the magnetic field is out of the page, as shown in the figure. The electric charge of each of the three particles is, respectively.

• 1 is neutral, 2 is negative, and 3 is

  positive

• 1 is neutral, 2 is positive, and 3 is

  negative

• 1 is positive, 2 is negative, and 3 is

  neutral

• 1 is negative, 2 is neutral, and 3 is

  positive