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Questions and Answers
What happens to the strength of the magnetic field when the current flowing through a wire is doubled?
What happens to the strength of the magnetic field when the current flowing through a wire is doubled?
According to the right-hand grip rule, which direction do your fingers curl if your thumb points in the direction of the current?
According to the right-hand grip rule, which direction do your fingers curl if your thumb points in the direction of the current?
How does the density of the magnetic field lines change as you move further away from a current-carrying wire?
How does the density of the magnetic field lines change as you move further away from a current-carrying wire?
If two parallel wires carry currents in the same direction, what can you conclude about the magnetic field between the two wires?
If two parallel wires carry currents in the same direction, what can you conclude about the magnetic field between the two wires?
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What is the effect of reversing the direction of current in a wire on the magnetic field around it?
What is the effect of reversing the direction of current in a wire on the magnetic field around it?
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Study Notes
Right-Hand Grip Rule
- If you grip a wire with your right hand, such that your thumb points in the direction of the current, your fingers will curl in the direction of the magnetic field.
Magnitude of Magnetic Field
- The strength of a magnetic field near a wire is directly proportional to the current.
- The strength of the field is inversely proportional to the distance from the wire.
- Doubling the current doubles the field strength at every point.
- The farther away from the wire, the weaker the field.
Exercises
Magnetic Field Lines of a Wire
- Sketch the magnetic field lines around a long, vertical current-carrying wire.
- The density of field lines decreases as the distance from the wire increases.
- Doubling the current doubles the density of field lines.
- Reversing the current reverses the direction of the field lines.
Two Parallel Wires
- Consider two parallel wires carrying currents in the same direction.
- There is a point where the net magnetic field is zero.
- Sketch the magnetic flux pattern around both wires.
- Reversing the current in one wire changes the location of the zero-field point and the flux patterns.
Magnetic Field Pattern Around a Wire
- Draw a diagram showing the magnetic field pattern around a wire with current flowing into the plane of the paper.
- Use the right-hand rule to determine the direction of the magnetic field.
Proving Changes in Magnetic Field
- Describe a simple method to prove that the magnetic field around a wire changes with current changes and direction changes.
- Increase the current; the magnetic field strength increases.
- Reverse the current; the magnetic field direction reverses.
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Description
Explore the concepts of magnetic fields generated by current-carrying wires in this quiz. Learn about the right-hand grip rule, the relationship between current and magnetic field strength, and how field lines are affected by the presence of other wires. Test your understanding with exercises about magnetic field lines and interactions between parallel wires.
