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Two charged particles held a certain distance apart are released. As they move, the acceleration of each decreases. Therefore, their charges have
the same sign.
When a light bulb is connected to a 4.5 V battery, a current of 0.12 A passes through the bulb filament. What is the resistance of the filament?
38 ohn
Each of the resistors in the circuit shown have a resistance of 160.0 Ω. What is the equivalent resistance of the circuit?
400 ohn
The resistors in the circuit shown each have a resistance of 600 Ω. What is the equivalent resistance of the circuit?
600 ohn
Two charged particles attract each other with a force F. If the charges of both particles are doubled, and the distance between them also doubled, then the force of attraction will be
F
Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is also doubled, then the force will be
F/2
Electric field lines begin on negative charges and end on positive charges.
False
If a 75 W bulb and a 100 W bulb are connected in series across a 120 V outlet, the 75 W bulb will dissipate 75 W of power and the 100 W bulb will dissipate 100 W of power.
False
If you double the diameter of a cylindrical wire, you double its conductivity but reduce its resistivity by one half.
False
A 9 V battery is hooked up to two resistors in series. One has a resistance of 5 Ω, and the other has a resistance of 10 Ω. Several locations along the circuit are marked with letters, as shown in the figure. Which statement is true?
The current at A is equal to the current at B, which is equal to the current at C, which is equal to the current at D.
A positive ion has more
protons than electrons.
If two point charges exert a force of 1 N on each other when they are 3 cm apart, they will exert a force of 1/25 N when they are 15 cm apart.
True
In the metal wires of a circuit, the electron current i flows from the negative to the positive end of a battery, but the current I flows from the positive to the negative end of the battery.
True
The more closely electric field lines are packed together, the stronger the field.
True
When a potential difference of 10 V is placed across a certain solid cylindrical resistor, the current through it is 2.0 A. If the diameter of this resistor is now tripled, the current will be 18 A.
True
The electric field at point P due to a point charge Q a distance R away has magnitude E. In order to double the magnitude of the field at P, you could
double the charge to 2Q
In an electrically neutral atom the number of protons in the nucleus is equal to the number of
electrons that surround the nucleus.
To become a negative ion, an atom must
gain an electron
If the length and diameter of a wire of circular cross section are both doubled, the resistance
halved
Two charged particles held a certain distance apart are released. As they move, the force on each particle increases. Therefore, their charges have
opposite signs