Question:
The magnetic field at a point due to a current carrying conductor is directly proportional to
The magnetic field at a point due to a current carrying conductor is directly proportional to
Updated On: Apr 15, 2024
- resistance of the conductor
- thickness of the conductor
- current flowing through the conductor
- distance from the conductor
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The Correct Option is C
Solution and Explanation
The magnetic field at a point due to a current carrying conductor is given by Biot- Savart law.
$
B =\frac{\mu_{0} I }{4 \pi} \frac{( dl \times r )}{ r ^{3}}
$
So the field is directly proportional to the current.
$
B =\frac{\mu_{0} I }{4 \pi} \frac{( dl \times r )}{ r ^{3}}
$
So the field is directly proportional to the current.
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Concepts Used:
Magnetic Field
The magnetic field is a field created by moving electric charges. It is a force field that exerts a force on materials such as iron when they are placed in its vicinity. Magnetic fields do not require a medium to propagate; they can even propagate in a vacuum. Magnetic field also referred to as a vector field, describes the magnetic influence on moving electric charges, magnetic materials, and electric currents.
A magnetic field can be presented in two ways.
- Magnetic Field Vector: The magnetic field is described mathematically as a vector field. This vector field can be plotted directly as a set of many vectors drawn on a grid. Each vector points in the direction that a compass would point and has length dependent on the strength of the magnetic force.
- Magnetic Field Lines: An alternative way to represent the information contained within a vector field is with the use of field lines. Here we dispense with the grid pattern and connect the vectors with smooth lines.
Properties of Magnetic Field Lines
- Magnetic field lines never cross each other
- The density of the field lines indicates the strength of the field
- Magnetic field lines always make closed-loops
- Magnetic field lines always emerge or start from the north pole and terminate at the south pole.