PhysicsLAB: Magnetic Forces on Moving Charges

Worksheet
Magnetic Forces on Moving Charges

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Refer to the following information for the next two questions.

If the orange "diamond" particle shown above is negatively charged, in which direction is the magnetic force acting on it while it is at the position shown?

towards the right side of the page (+x)
towards the left side of the page (-x)
towards the top of the page (+y)
towards the bottom of the page (-y)
none of the above

True or False? As the magnetic force acts on the particles shown in the diagram above, it does work on each one. This would be evidenced by a change in the kinetic energy of each particle.

TrueFalse

Refer to the following information for the next two questions.

If the blue "plus sign" particle shown below is positively charged, in which direction will the magnetic force act on it while it is at the position shown?

towards the right side of the page (+x)
towards the left side of the page (-x)
towards the top of the page (+y)
towards the bottom of the page (-y)
none of the above

If the green "square" particle shown above is positively charged, in which direction will the magnetic force act on it while it is at the position shown?

along its direction of motion, speeding it up
against its direction of motion, slowing it down
perpendicular to its direction of motion, towards the upper right corner of the pages (45º), maintaining the particle's constant speed
perpendicular to its direction of motion, towards the lower left corner of the pages (225º), maintaining the particle's constant speed
the green square particle would not experience any magnetic force.

Refer to the following information for the next five questions.

A radioactive source gives off positively charged particles. Only specific particles having a predetermined "selected velocity" are permitted to travel through Region I into the Region II.

If the magnetic field (green shaded areas) is oriented in the same direction throughout the diagram, which way is it pointed?

into the plane of the page (-z)
out of the plane of the page (+z)
towards the top of the page (+y)
towards the bottom of the page (-y)

Region I that is located between the parallel plates is called a velocity selector. What is the relationship between the particle's selected speed and the strengths of the crossed magnetic and electric fields?

Given that the magnetic field is 2 T and the electric field is 10,000 V/m. If alpha particles are being released, having a charge of +|2e| and a mass of 6.65 x 10^-27 kg, what is the radius of their circular orbit in the second region?

If the radioactive source also gave off neutrons, in which direction would they travel in Region II?

towards the top of the page (+y)
towards the bottom of the page (-y)
towards the right side of the page (+x)
out of the plane of the page (+z)
into the plane of the page (-z)

If the radioactive source also gave off protons, how would the radius of their orbit in Region II compare to that of the alpha particles? Protons have a charge of +|e| and a mass of 1.67 x 10^-27 kg.

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