Question:
A 100 millihenry coil carries a current of 1 A. Energy
stored in its magnetic field is
A 100 millihenry coil carries a current of 1 A. Energy
stored in its magnetic field is
Updated On: Jul 29, 2024
- 0.5 J
- 1 A
- 0.05 J
- 0.1 J
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The Correct Option is C
Solution and Explanation
$E=\frac{1}{2}Li^2=\frac{1}{2}\times(100\times10^{-3})\times1^2=0.05 \, J$
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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.