AP Free Response Question
2009 Form B  B2
Printer Friendly Version
Three particles are arranged on coordinate axes as shown above. Particle A has charge q
_{A}
=

0.20 nC , and is initially on the yaxis at y = 0.030 m. The other two particles each have charge q
_{B}
= +0.30 nC and are held fixed on the xaxis at x =

0.040 meters and x = +0.040 meters, respectively.
(a) Calculate the magnitude of the net electric force on particle A when it is at y = 0.030 m, and state its direction.
(b) Particle A is then released from rest. Qualitatively describe its motion over a long time.
In another experiment, particle A of charge q
_{A}
=

0.20 nC is injected into a uniform magnetic field of strength 0.50 T directed into the page, as shown below, entering the field with speed 6000 m/s.
(c) On the diagram above, sketch a complete path of particle A as it moves in the magnetic field.
(d) Calculate the magnitude of the force the magnetic field exerts on particle A as it enters the magnetic field.
(e) An electric field can be applied to keep particle A moving in a straight line through the magnetic field. Calculate the magnitude of this electric field and state its direction.
Topic Formulas
Description
Published Formula
capacitance
Coulomb's Law
elastic potential energy
electric field
electric potential energy
energy stored in a capacitor
Faraday's Law
kinetic energy
magnetic field around a currentcarrying wire
magnetic flux
magnetic force on a currentcarrying wire
magnetic force on a moving charge
parallelplate capacitor
potential and electric field strength
potential due to a collection of point charges
potential energy
power
power
work
Related Documents
Lab:
Labs 
A Battering Ram
Labs 
A Photoelectric Effect Analogy
Labs 
Air Track Collisions
Labs 
Aluminum Foil Parallel Plate Capacitors
Labs 
Ballistic Pendulum
Labs 
Ballistic Pendulum: Muzzle Velocity
Labs 
Bouncing Steel Spheres
Labs 
Collision Pendulum: Muzzle Velocity
Labs 
Conservation of Energy and Vertical Circles
Labs 
Conservation of Momentum in TwoDimensions
Labs 
Electric Field Mapping
Labs 
Electric Field Mapping 2
Labs 
Forces Between Ceramic Magnets
Labs 
Inelastic Collision  Velocity of a Softball
Labs 
LooptheLoop
Labs 
Magnetic Field in a Solenoid
Labs 
Mass of an Electron
Labs 
Ramps: Sliding vs Rolling
Labs 
RC Time Constants
Labs 
Roller Coaster, Projectile Motion, and Energy
Labs 
Rotational Inertia
Labs 
Rube Goldberg Challenge
Labs 
Spring Carts
Labs 
Target Lab: Ball Bearing Rolling Down an Inclined Plane
Labs 
Telegraph Project
Labs 
Video Lab: Blowdart Colliding with Cart
Labs 
Video LAB: Circular Motion
Labs 
Video Lab: M&M Collides with Pop Can
Labs 
Video Lab: Marble Collides with Ballistic Pendulum
Resource Lesson:
RL 
A Comparison of RC and RL Circuits
RL 
A Guide to BiotSavart Law
RL 
Ampere's Law
RL 
APC: Work Notation
RL 
Capacitors and Dielectrics
RL 
Conservation of Energy and Springs
RL 
Continuous Charge Distributions: Charged Rods and Rings
RL 
Continuous Charge Distributions: Electric Potential
RL 
Coulomb's Law: Beyond the Fundamentals
RL 
Coulomb's Law: Suspended Spheres
RL 
Derivation of Bohr's Model for the Hydrogen Spectrum
RL 
Dielectrics: Beyond the Fundamentals
RL 
Eddy Currents plus a Lab Simulation
RL 
Electric Field Strength vs Electric Potential
RL 
Electric Fields: Parallel Plates
RL 
Electric Fields: Point Charges
RL 
Electric Potential Energy: Point Charges
RL 
Electric Potential: Point Charges
RL 
Electricity and Magnetism Background
RL 
Electrostatics Fundamentals
RL 
Energy Conservation in Simple Pendulums
RL 
Famous Experiments: Cathode Rays
RL 
Famous Experiments: Millikan's Oil Drop
RL 
Gauss' Law
RL 
Gravitational Energy Wells
RL 
Introduction to Magnetism
RL 
LC Circuit
RL 
Magnetic Field Along the Axis of a Current Loop
RL 
Magnetic Forces on Particles (Part II)
RL 
Magnetism: CurrentCarrying Wires
RL 
Maxwell's Equations
RL 
Mechanical Energy
RL 
Meters: CurrentCarrying Coils
RL 
Momentum and Energy
RL 
Parallel Plate Capacitors
RL 
Potential Energy Functions
RL 
Principal of Least Action
RL 
Rotational Dynamics: Pivoting Rods
RL 
Rotational Kinetic Energy
RL 
Shells and Conductors
RL 
Spherical, Parallel Plate, and Cylindrical Capacitors
RL 
Springs and Blocks
RL 
Symmetries in Physics
RL 
Tension Cases: Four Special Situations
RL 
Torque on a CurrentCarrying Loop
RL 
Work
RL 
Work and Energy
Review:
REV 
Drill: Electrostatics
REV 
Electrostatics Point Charges Review
Worksheet:
APP 
Maggie
APP 
The Birthday Cake
APP 
The Electrostatic Induction
APP 
The Jogger
APP 
The Pepsi Challenge
APP 
The Pet Rock
APP 
The Pool Game
APP 
The Tree House
CP 
Conservation of Energy
CP 
Coulomb's Law
CP 
Electric Potential
CP 
Electrostatics: Induction and Conduction
CP 
Magnetism
CP 
Momentum and Energy
CP 
Momentum and Kinetic Energy
CP 
Power Production
CP 
Satellites: Circular and Elliptical
CP 
Work and Energy
NT 
Bar Magnets
NT 
Cliffs
NT 
Electric Potential vs Electric Potential Energy
NT 
Electrostatic Attraction
NT 
Elliptical Orbits
NT 
Escape Velocity
NT 
Gravitation #2
NT 
Lightning
NT 
Magnetic Forces
NT 
Meters and Motors
NT 
Photoelectric Effect
NT 
Potential
NT 
Ramps
NT 
Satellite Positions
NT 
Van de Graaff
NT 
Water Stream
WS 
Advanced Properties of Freely Falling Bodies #1
WS 
Advanced Properties of Freely Falling Bodies #2
WS 
Advanced Properties of Freely Falling Bodies #3
WS 
Capacitors  Connected/Disconnected Batteries
WS 
Charged Projectiles in Uniform Electric Fields
WS 
Combinations of Capacitors
WS 
Coulomb Force Extra Practice
WS 
Coulomb's Law: Some Practice with Proportions
WS 
Electric Field Drill: Point Charges
WS 
Electric Fields: Parallel Plates
WS 
Electric Potential Drill: Point Charges
WS 
Electrostatic Forces and Fields: Point Charges
WS 
Electrostatic Vocabulary
WS 
Energy Methods: More Practice with Projectiles
WS 
Energy Methods: Projectiles
WS 
Energy/Work Vocabulary
WS 
Force vs Displacement Graphs
WS 
Introduction to Springs
WS 
Kinematics Along With Work/Energy
WS 
Magnetic Forces on CurrentCarrying Wires
WS 
Magnetic Forces on Moving Charges
WS 
Parallel Reading  The Atom
WS 
Potential Energy Functions
WS 
Practice with Ampere's Law
WS 
Practice: Momentum and Energy #1
WS 
Practice: Momentum and Energy #2
WS 
Practice: Vertical Circular Motion
WS 
Rotational Kinetic Energy
WS 
Standard Model: Particles and Forces
WS 
Static Springs: The Basics
WS 
Work and Energy Practice: An Assortment of Situations
WS 
Work and Energy Practice: Forces at Angles
TB 
36A: Magnets, Magnetic Fields, Particles
TB 
36B: Current Carrying Wires
TB 
Advanced Capacitors
TB 
Basic Capacitors
TB 
Electric Field Strength vs Electric Potential
TB 
Exercises on Current Carrying Wires
TB 
Work, Power, Kinetic Energy
CBETS
Copyright © 19702022
All rights reserved.
Used with
permission
Mainland High School
Daytona Beach, FL 32114