How does the magnetic field produced by a current-carrying wire change with distance from the wire?
It decreases as distance increases
A current-carrying wire sets up concentric circular magnetic field lines around it, and the strength of this field at any point depends on how far that point lies from the wire.
For a long, straight conductor, the magnetic field strength B is given by B = μ₀I / (2πr), where I is the current and r is the perpendicular distance from the wire.
Since B is inversely proportional to r, the field becomes weaker as the distance from the wire increases, and stronger as one moves closer to it.
Hence, the correct answer is It decreases as distance increases.
Similar Questions
A single-turn coil of radius R produces a magnetic field B at its centre. If the same wire is wound into a coil of n turns (each of radius R/n) carrying the same current I, what will be the value of the new field at the centre?
A student places a compass near a straight, current-carrying conductor and observes the needle deflect. What does this observation indicate about the region around the conductor?
In Fleming's Left Hand Rule, which finger represents the direction of the magnetic field?
What does a higher degree of closeness of magnetic field lines indicate?
A device uses the principle of magnetic fields around a current-carrying conductor to convert electrical energy to mechanical energy. Which device operates on this principle?
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A student wants to use the Right Hand Thumb Rule to determine the direction of the magnetic field around a current-carrying straight conductor. Which of the following steps is essential in applying the rule correctly?
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An electron enters a uniform magnetic field at right angles to it. If the magnetic field is directed into the page and the electron enters toward the right, what is the direction of the force acting on the electron?
Important Questions from Magnetism
- The magnetic field around a straight current-carrying conductor:
Magnetic field is a quantity that has___________________ .
- The right-hand thumb rule is used to find which of the following?
- How are the magnetic field lines arranged inside a current-carrying solenoid?
- What does it mean when magnetic field lines are drawn closer together in a diagram?
