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Gravity
Chapter 19 + 20
Terms in this set (58)
The charge on the proton is the same as
the charge on the electron, but of the opposite sign
When a glass rod is rubbed with a piece of silk, the glass rod acquires a positive charge and the silk acquires a negative charge.
the glass rod lost electrons to the piece of silk.
Electrical and gravitational forces follow similar equations with one main difference
Gravitational forces are always attractive but electrical forces can be attractive or repulsive.
The main difference between conductors and insulators is in terms of
valence or conduction electrons
Two charges, Q1 and Q2, are separated by a certain distance. The ratio of charge Q1 to charge Q2 is 1:2. The ratio of force on Q1 to the force on Q2 is
1:1
Find the net charge of a system consisting of 6.15 X 10⁶ electrons and 7.44 X 10⁶ protons?
2.064 X 10⁻¹³ C
Find the net charge of a system consisting of 212 electrons and 165 protons
-7.5 X 10⁻¹⁸ C
Find the total electric charge of 1.5 kg of electrons
-.0264 X 10¹²
Find the total electric charge of 1.5 kg of protons
1.43 X 10⁻¹⁹C
When the distance between the two charges is doubled, the force between them is
reduced by a factor of 4
When the magnitude of two charges is increased by a factor of 2, the electrical forces between these charges is
quadrupled
Two charges, Q1 and Q2, are separated by a certain distance R. If the magnitudes of the charges are doubled and their separation is also doubled, then what happens to the electrical force between these two charges?
It remains the same
Three equal charges are at three of the corners of a square of side d. A fourth charge of equal magnitude is at the center of the square as shown in Figure 19-1. Which of the arrows shown represents the net force acting on the charge at the center of the square?
B
Four point charges of equal magnitude and sign are arranged on three of the corners of the square of side d as shown in Figure 19-6. Which of the arrows shown represents the net force acting on the charge at the upper right hand corner of the square?
D
The force of attraction between a -40.0 µC and + 108 µC charge is 4.00 N. What is the separation between these two charges?
3.12 m
Three point charges of magnitudes +6.0 µC, -7.0 µC, and -13 µC are placed on the x-axis at x = 0 cm, x = 40 cm, and x = 120 cm, respectively. What is the force on the -13 µC charge due to the other two charges?
0.79 N
Three equal point charges are placed at the corners of a square of side d as shown in Figure 19-13. Which of the arrows shown represents the direction of the net electric field at the center of the square?
A
A point charge Q = 6.00 × 10-9 C is placed at the origin of an x-y coordinate system. What is the electric field intensity E at a distance of x = 30 cm from this charge? (Use k = 9 ×109 Nm2/C2.)
600 N/C
A uniform electric field with a magnitude of 8 × 106 N/C is applied to a cube of edge length 0.1 m as shown in Figure 19-20. If the direction of the E-field is along the +x-axis, what is the electric flux passing through the shaded face of the cube?
8 × 10⁴ Nm2/C
Find the net charge of a system consisting of 4.97 X 10⁷ electrons
-7.84 X10⁻¹²
How many negative electric charge is contained in 2 moles of carbon?
-1.156 X10⁶ C
a positive and negative are initally 4cm apart. When they are moved closer together so that they are now 1cm apart. The forces between them is
Increase by a factor of 16
given that that 12uc and d=16cm, find the direction and magnitude of the net elextrostatic force exerted on the point charge q1? q2=-2.0, q3=+3.0
62 N
Find the direction of magnitude of the net electrostatic force exerted on the point charch q₂in figure 19-32. Let +2.4 uC and d= 33cm , Q1= q, Q2= 2q, Q3,=3.0q Q4=4.0
5.439 N
Find the direction of magnitude of the net electrostatic force exerted on the point charch q₂in figure 19-32. Let +2.4 uC and d= 33cm , Q1= q, Q2= 2q, Q3,=3.0q Q4=4.0
5.439 N
What is the magnitude of an electric field produced by a charge of a magnitude 7.50uc at a distance of 1m?
6.75 X10⁴
What is the magnitude of an electric field produced by a charge of a magnitude 7.50uc at a distance of 2m?
1.69 X10⁴
A +5.0uc charge exeperience of 0.44N force in the positive y direction. If this charge is replaced with a -3.7 Uc charge what force will it experience
-0.24 N
Electric potential is a scalar quantity.
true
Electric potential is a scalar quantity.
true
A charged particle with charge +5.0 µC is initially at rest. It is accelerated through a potential difference of 500 V. What is the kinetic energy of this charged particle
2.5 × 10-3 J
A charged particle with charge +5.0 µC is initially at rest. It is accelerated through a potential difference of 500 V. What is the kinetic energy of this charged particle
2.5 × 10-3 J
An electron, initially at rest is accelerated through a potential difference of 450 V. What is the speed of the electron due to this potential difference?
12.6 × 106 m/s
An electron, initially at rest is accelerated through a potential difference of 450 V. What is the speed of the electron due to this potential difference?
12.6 × 106 m/s
An electron is carried from the positive terminal to the negative terminal of a 9 V battery. How much work is required in carrying this electron?
14.4 × 10-19 J
An electron is carried from the positive terminal to the negative terminal of a 9 V battery. How much work is required in carrying this electron?
14.4 × 10-19 J
A proton falls through a potential drop of 400 V. How much is the change of potential energy of this proton in falling through this potential drop?
-6.4 × 10-17 J
A proton falls through a potential drop of 400 V. How much is the change of potential energy of this proton in falling through this potential drop?
-6.4 × 10-17 J
When an electron moves in a direction opposite to the electric field, its potential increases but the potential energy decreases.
True
When an electron moves in a direction opposite to the electric field, its potential increases but the potential energy decreases.
True
The electron-volt is a unit of
energy
The electron-volt is a unit of
energy
The potential energy at x = 8 m is -2000 V and at x = 2 m is +400 V. What is the magnitude and direction of the electric field?
400 V/m directed parallel to the +x-axis
The potential energy at x = 8 m is -2000 V and at x = 2 m is +400 V. What is the magnitude and direction of the electric field?
400 V/m directed parallel to the +x-axis
An 800 V/m electric field is directed along the +x-axis. If the potential at x = 0 m is 2000 V, what is the potential at x = 2 m?
400 V
An 800 V/m electric field is directed along the +x-axis. If the potential at x = 0 m is 2000 V, what is the potential at x = 2 m?
400 V
A 4.0 X 10-6 C charge is situated at the origin of an xy-coordinate system. What is the magnitude and direction of the electric potential at x = 6.0 m?
6000 V with no direction, as it is a scalar quantity
A 4.0 X 10-6 C charge is situated at the origin of an xy-coordinate system. What is the magnitude and direction of the electric potential at x = 6.0 m?
6000 V with no direction, as it is a scalar quantity
Which of the following will increase the capacitance of a parallel plate capacitor?
an increase in the plate area and a decrease in the plate separation
Which of the following will increase the capacitance of a parallel plate capacitor?
an increase in the plate area and a decrease in the plate separation
A parallel plate capacitor with plate separation of 4.0 cm has a plate area of 4.0 × 10-2 m2. What is the capacitance of this capacitor with air between these plates?
8.9 × 10-12 F
A parallel plate capacitor with plate separation of 4.0 cm has a plate area of 4.0 × 10-2 m2. What is the capacitance of this capacitor with air between these plates?
8.9 × 10-12 F
The magnitude of the charge on each plate of a parallel plate capacitor is 4 µC and the potential difference between the plates is 80 V. What is the capacitance of this capacitor?
5 × 10-8 F
The magnitude of the charge on each plate of a parallel plate capacitor is 4 µC and the potential difference between the plates is 80 V. What is the capacitance of this capacitor?
5 × 10-8 F
A 20-µF capacitor has a charge of 60 µC. How much energy is stored in this capacitor?
90 µJ
A 20-µF capacitor has a charge of 60 µC. How much energy is stored in this capacitor?
90 µJ
A parallel plate capacitor has a potential difference between the plates of 80 V. If the charge on one of the plates of the capacitor is +8.0 µC, what is the electrical energy stored by this capacitor?
320 × 10-6 J
A parallel plate capacitor has a potential difference between the plates of 80 V. If the charge on one of the plates of the capacitor is +8.0 µC, what is the electrical energy stored by this capacitor?
320 × 10-6 J
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