A 6 V battery is connected to a 24 ohm resistor to create a circuit. The 6 V battery is then replaced with a 12 V battery. How d
oes the current change in the circuit when the 12 V battery is used instead of the 6 V battery? *
3 points
The current is reduced by one-fourth.
The current is reduced by one-half.
The current is doubled.
The current is tripled.
Which of the following actions can produce an electric current in a loop of wire? *
2 points
spinning the wire near a battery
placing a resistor at the end of the wire
heating a switch and placing it on the wire
moving a magnet up and down near the wire
A student began an investigation by wrapping several coils of insulated wire around a steel nail. As shown in the diagram, when the ends of the wire were connected to a battery, the student was able to pick up several steel paperclips with the end of the steel nail. Which of the following claims is best supported by the student’s investigation? *
2 points
Captionless Image
An electric current in the wire produces a magnetic field.
An electric current in the wire produces a potential difference.
A magnetic field can produce an electric current in the wire.
A magnetic field can produce an electric current in steel paper clips
A student made the graph below to show how the amount of electrical force between two charged particles depend son another variable. The student’s graph is missing a label for the x-axis. What should the student label the x-axis? *
2 points
Captionless Image
Volume of Particles (m^3)
Mass of One Particle (kg)
Charge of One Particle (C)
Distance between Particles (m)
3 points
The current is reduced by one-fourth.
The current is reduced by one-half.
The current is doubled.
The current is tripled.
Which of the following actions can produce an electric current in a loop of wire? *
2 points
spinning the wire near a battery
placing a resistor at the end of the wire
heating a switch and placing it on the wire
moving a magnet up and down near the wire
A student began an investigation by wrapping several coils of insulated wire around a steel nail. As shown in the diagram, when the ends of the wire were connected to a battery, the student was able to pick up several steel paperclips with the end of the steel nail. Which of the following claims is best supported by the student’s investigation? *
2 points
Captionless Image
An electric current in the wire produces a magnetic field.
An electric current in the wire produces a potential difference.
A magnetic field can produce an electric current in the wire.
A magnetic field can produce an electric current in steel paper clips
A student made the graph below to show how the amount of electrical force between two charged particles depend son another variable. The student’s graph is missing a label for the x-axis. What should the student label the x-axis? *
2 points
Captionless Image
Volume of Particles (m^3)
Mass of One Particle (kg)
Charge of One Particle (C)
Distance between Particles (m)
1 answer:
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(1) Doubling of the current through the wire will result in doubling of its magnetic field.
The magnetic field around a wire is a function of the current I and radial distance r
(with mu denoting the magnetic permeability of the medium). So, B is directly proportional to I. The field magnitude will double with the doubled current from 5A to 10A
(2) Using the same formula as in (1), we can see that the magnetic field is inversely proportional to the radial distance from the wire. So, a particle at 20cm will experience half the magnitude compared to a particle at 10cm.
(3) Answer
If a particle with a charge q moves through a magnetic field B with velocity v, it will be acted on by the magnetic force
So, a particle with charge -2uC will experience a magnetic force of same magnitude but opposite direction (and perpendicular to B) as compared to a particle with a charge of 2uC