Question:
The magnetic field $ \vec{B} $ in a circular coil does not depend on:
The magnetic field $ \vec{B} $ in a circular coil does not depend on:
Updated On: Jul 14, 2022
- current
- radius
- number of turns
- area
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The Correct Option is D
Solution and Explanation
The magnetic field at the centre of circular coil
$B=\frac{\mu_{0} n I}{2 r}$
where $r=$ radius of coil
$I=$ current flowing in the coil.
$n=$ number of turns in a coil
Therefore, magnetic field in a circular coil does not depend on area of coil.
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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.