SP212‐Spring‐2016 CH‐28‐A Assignment First do the following Wiley‐Plus assignment: Assignment #28a After completing the Wiley‐Plus, in your homework notebook, complete the following problems: CH28 Questions # 1, 2, 4, and 6. CH28 Problems # 1, 3, 7, and 9 To check your work, the answers to the odd problems are in the back of the book. The answers to the even problems are: None Assigned this assignment. Homework Then complete the attached worksheets: (Note: the above problems were designed to ensure you have the skills to solve the worksheet problems. It is imperative to your learning of the problem solving technique to do the above problems BEFORE attempting the worksheet problems. You are graded on both! Homework notebooks are graded.) CH‐28‐A‐1: For each of the equations below, 1) State what each term is in your own words … 2) What the units of each term are… 3) What is the general use of that equation in your own words? A.
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 
FB  q(v  B) B. q vB 
mv2 R
C.
  2  2 f 
T
qB
m
D. Describehowtodotherighthandruleassociatedwiththe
equationinpartA.(PretendIamafouryearoldandteachmehow
todotheRHR)
CH‐28‐A‐2: A particle with a charge of q = ‐ 2.0 C moves through a uniform magnetic field. Its m

velocity is v  (2iˆ  3 ˆj  1kˆ) and the external B field is B  (4iˆ  20 ˆj  Bz kˆ)mT . s
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If the net force is F  (0.032iˆ  Fy ˆj  0.104kˆ) N , what are the missing terms (BZ and Fy)? Show all work I = J K CH‐28‐A‐3: The next two parts of this question deal with the Magnetic Force Laboratory (Lab 6) (which you will conduct on Monday) where electrons are accelerated through a potential difference (voltage) and enter a region of constant, uniform magnetic field. A cross section of the top of the equipment is shown in the following diagram. The electrons are emitted by the filament (red dot) and accelerated because there is a potential difference (voltage) between the filament and the can. The electrons exit the bottom of the can with a speed of 3x106 m/s. The magnetic field has a magnitude of 3x10‐4 T and is in such a direction as to deflect the electrons so that they strike a peg. (The peg letters below are diameters of the circular path the electrons take.) a) The electrons strike the peg closest to the point: Show all work b) If the time an electron leaves the can is t=0, then what is the specific time (in nanoseconds) it takes an electron to return to the filament (assuming it is traveling Counter Clockwise)? Show all work CH‐28‐A‐4: m
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The Figure below shows a particle of charge q = ‐ 2.0 × 10‐15 C and velocity v  (200 ) ˆj s
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as it moves through a uniform magnetic field B  ( 3.0 x10 4 T )iˆ . What electric field will allow the particle to move along the y axis unperturbed (and thus in a straight line)? Show all work