1. (5pts) The charge carriers associated with a current are electrons, which are
ID: 1401779 • Letter: 1
Question
1. (5pts) The charge carriers associated with a current are electrons, which are negatively charged. Explain why the right hand rule for the direction of the force associated with a charged particle moving in a magnetic field applies to current flow despite the fact that the rule is meant to apply to positive particles moving in a magnetic field.
2. (3pts) In 1934 E. O. Wilson and M. S. Livingston invented what device?
3. (15pts) Draw the basic configuration of a cylclotron, explain how it accelerates charged particles, and ARRIVE at an expression for the maximum kinetic energy of a charged particle as it exits a cyclotron.
4. (10pts) Calculate the maximum attainable kinetic energy of protons in a cyclotron of radius 0.7 meters with a magnetic field of 0.98 Tesla.
5. (6pts)
a. What is the Lorentz Force on a charged particle? (Explain WHAT it is…)
b. Write down the expression for this force.
6. (10pts) Using the concept of the Lorentz force experienced by a charged particle explain how one could create a device that separates charges of a desired velocity from a beam of particles with varying velocities.
7. (3pts)……True/False…..Magnetic monopoles are common in nature.
8. (3pts)……True/False….Accidentally using your left hand rather than your right when crossing two vectors changes the magnitude of the resultant vector.
9. (6pts) Michael Faraday concluded from his experiments that an EMF in induced in a circuit when the ___________________________ through the circuit ____________________ with time.
10. (6pts) A charged particle moving through a uniform magnetic field in a direction perpendicular to the field follows a __________________________ path. However, if the particles trajectory makes an angle with the magnetic field other than 0°, 90°, or 180° that path is _________________________.
11. (5pts) The charge on the square plates of a parallel-plate capacitor is Q. The potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. The amount of charge on the plates is now equal to
a. A) 4Q.
b. B) 2Q.
c. C) Q.
d. D) Q/2.
e. E) Q/4.
12. (3pts) What does the Bio-Savart Law give?
13. (6pts) In 1879 Edwin Hall discovered the effect now named after him. What is the Hall effect? A diagram may help.
Explanation / Answer
right hand rule says that direction of magnetic force on a positive charge will be the direction of thumb if fingers are curled in the directon from velocity vector to magnetic field vector
direction of current is in the opposite direction of the direction of motion of the electron and for negative charged particle the direction of magnetic force will be opposite that is 180 degree from the direction of positive charge
which is same as if protons are flowing hence right hand rule for the direction of the force associated with a charged particle moving in a magnetic field applies to current flow despite the fact that the rule is meant to apply to positive particles moving in a magnetic field
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