$ 1\,Wb/m^2 $ is equal to :
- $ 10^4 $ gauss
- $ 4\pi \times 10^{-3} $ gauss
- $ 10^2 $ gauss
- $ 10^{-4} $ gauss
The Correct Option is A
Solution and Explanation
If a charge of $1 C$ moving with a velocity of $1 m / s$ perpendicular to a uniform magnetic field experiences a force of $1 N$, then the magnitude of the field is $1 T$. The SI unit of magnetic field is $Wb \,m ^{-2}$. Thus,
$1 \,T =1 \,NA ^{-1} \,m ^{-1}=1 \,Wb\, m ^{-2}$
In CGS systems
1 tesla $=10^{4} $ gauss $=1 \,Wb \,m ^{-2}$
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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.