Homework, Chapter 1
1) An alpha particle (charge = +2.0e) is1.0 meter from a gold
nucleus (charge = +79e) and is traveling at a speed of 1´104 m/s.
a) Write a parametric expression (ie. in terms of time) for the
position of the particle .
b) Derive the expressions for velocity and acceleration.
c) What is the velocity when the alpha particle reaches the gold
nucleus?
General Physics II
Chapter 1, Forces & Fields
Page 39
2) Three charges are arranged as shown in this figure. Find
the magnitude and direction of the electrostatic force on q1,
the 6.00-nC charge.
General Physics II
Chapter 1, Forces & Fields
Page 40
3) An object with a net charge of 12 μC is placed in a uniform
electric field of 610 N/C, directed vertically as shown in this
figure. What is the mass of the object if it "floats" in the electric
field? Does the particle have a positive or negative charge?
General Physics II
Chapter 1, Forces & Fields
Page 41
4) A proton is accelerated by a constant electric field of magnitude
1250 N/C. (a) Find the acceleration of the electron. (b) What is the
electron's speed after 1.00´10-8 s, assuming it starts from rest.
General Physics II
Chapter 1, Forces & Fields
Page 42
5) A beam of electrons must travel between 2 charged plates and
exit so they just miss the top plate. The electrons are traveling at a
speed of 1´104 m/s and enter at a position equidistant from both
plates. What must be the magnitude and direction of the electric
field for this to occur?
General Physics II
Chapter 1, Forces & Fields
Page 43
6) This figure shows the electric field lines for two point charges.
(a) Determine the ratio q1/ q2 (b) What are the signs of q1 and q2?
General Physics II
Chapter 1, Forces & Fields
Page 44
7) Find the expression for the electric field at the point P in terms
of q, d, and z.
General Physics II
Chapter 1, Forces & Fields
Page 45
8) Find
the electric field at point P. Express in terms of q, Z, and R.
General Physics II
Chapter 1, Forces & Fields
Page 46
9) Find
the electric field at point P. Express in terms of q, Z, and R.
General Physics II
Chapter 1, Forces & Fields
Page 47
General Physics II
Chapter 2, Potential
Page 48