# AP Physics Daily Problem #1

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AP Physics Daily Problem #101
Yes, you need to read Chapter 16 (Giancoli) or 15 (Hecht) before you do this problem!
Explain the operation of an electroscope. Be as detailed as possible!

Two 10g particles each have a positive charge of 4.0C and are located 0.2m apart.
What is the electric force on each charge?

The particles are free to move. What is their acceleration?
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+5.0C     0.3m   +5.0C
AP Physics Daily Problem #102                                                          A
Three 5.0g particles each have a charge of 5.0C and are       B
located 0.3m apart as shown here. Note that the lower

0.3m
charge is negative. Draw your estimate of the net force
vector on each particle.
C
On the following questions, the answer should include                                       -5.0C
direction and magnitude!
What is the force on particle A due to particle B?

What is the force on particle A due to particle C?

What is the net force on particle A?

All particles are free to move. What is the acceleration of particle A?
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+3.0C     0.2m     +3.0C
AP Physics Daily Problem #103                                                           A
Three particles are arranged in an equilateral triangle a
shown. Determine the magnitude and direction of the
force on one of the particles.

+3.0C

All particles are free to move and have a mass of 10g. What is the acceleration of the
particles?

Given the information above, determine the position of one of the particles 1 second after
it is released? If you cannot do this, explain why you cannot.
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+2.0C
AP Physics Daily Problem #104
Three particles are arranged in a vertical line as shown. Determine the
magnitude and direction of the force on the –1.0C particle due to the other            0.1m
particles.
-1.0C

0.2m

+8.0C

Determine the magnitude and direction of the force on the +8.0C particle due to the
other particles.
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20000N/C
AP Physics Daily Problem #105
A 10.0g particle of charge +5.0C and mass 10.0g is shot horizontally at a     10m/s
speed of 10.0m/s into a uniform upwardly directed electric field of strength
20000N/C. Neglect gravity
5.0C
Without doing calculations, describe the path of the particle.

Determine the force acting on the particle in the field

Determine the acceleration of the particle in the field.

Determine the velocity of the particle 1.0s after it enters the field.

Determine the position of the particle 1.0s after it enters the field

Would earth gravity make a significant difference in the position of the particle?
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AP Physics Daily Problem #106                                                                 2000V
A particle of charge +5.0C and mass 1.0g is shot horizontally at a speed       10m/s
of 10.0m/s equidistantly between two plates of potential 2000V and 0.0V.
The plates are spaced 1.0 meter apart and are 3 meters long. Neglect
gravity                                                                        5.0C

Determine the strength and direction of the electric field between the                        0.0V
plates.

Determine the force acting on the particle after it enters the field

Determine the acceleration of the particle in the field.

Determine whether or not the particle will strike one of the plates.

Carefully draw the path of the particle below. If the particle does not strike one of the
plates, show the path of the particle after it leaves the plates.
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AP Physics Daily Problem #107                                                                 10.0C

A -20C charge is located 0.40m to the left of location X. A 10C charge                         0.20m
is located 0.20m above location X.                                                    0.40m
X
-20.0C

Determine the strength and direction of the electric field at location X.

An electron is placed at location X and released. Draw the FBD of the electron

Determine the acceleration of the electron in the field.
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AP Physics Daily Problem #108
An electron is fired at a velocity of 3,000,000m/s midway between two conductive plates.
The plates are spaced 3cm apart and are 6.0cm long. The bottom plate is held at ground
potential. Neglect gravity

e-

0.0V
Determine the maximum and minimum voltages for the top plate that will still allow the
electron to exit the plates.

At the maximum voltage, determine the velocity of the electron as it leaves the plates.

How much work was done on the electron while it was between the plates?

Describe how you could find the speed of the electron as it leaves the plates using energy
methods

On the back of this sheet, discuss if gravity would have a significant effect.
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AP Physics Daily Problem #108a
Draw the electric field between these particles. Assume the magnitude of charge on the
two particles is identical.

+                                             —

Draw the electric field between these particles. Assume the magnitude of charge on the
two particles is identical.

+                                             +

Draw the electric field between these particles. Assume the magnitude of charge on the
three particles is identical.

+                                             —

+
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AP Physics Daily Problem #109
A 5.0C particle and location X are separated by a distance of 0.5m

5.0C
0.5m
X

Determine the electric potential due to the 5C particle at location X

A 10.0C particle is brought from a large distance away to location X. How much work
was done in moving the particle?

The 10C particle is released, while the 5.0C particle is considered to be stationary.
What is the maximum speed reached by the 10C particle? The 10C particle has a mass
of 1.0g
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AP Physics Daily Problem #110
An electron is released from a position between two charged plates. When released, the
electron is near a plate at a potential of –30V. It moves toward a plate which has a
potential of 50V
-30V                               50V

e-

Determine the electric potential energy of the electron at its starting location

Determine the electric potential energy of the electron just before it hits the 50V plate.

Determine the velocity of the electron as it hits the plate.

If the 50V plate has a mass of 500mg and is made of aluminum (c=900J/kgK), how many
electrons must move between the plates to raise the temperature of the 50V plate by
1.0C?

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