Q.The unit $Wbm^{-2}$ is equal to _____.

Magnetic field B is flux per unit area, so its unit is Wb/m^2, given the special name tesla.

Magnetic flux (phi) through a surface is measured in weber (Wb). Magnetic field B (also called magnetic flux density) is the flux PER UNIT AREA passing perpendicular to a surface:

B = phi / A

…

Magnetic flux density B is a vector quantity.

Magnetic flux density (magnetic field) B describes the strength and direction of a magnetic field. It has both a magnitude (measured in tesla) and a definite direction (given, for example, by the direction a compass needle points, or by the right-hand rule for a current). A quantity wi …

The SI unit of magnetic field (magnetic flux density), the tesla, is by definition equal to one weber per square metre.

Magnetic flux density B has SI unit tesla (T), and by definition:

1 T = 1 Wb/m^2 = 1 N/(A.m)

So a field of 5 T is simply:

5 T = 5 Wb/m^2

…

Magnetic flux is measured in weber (Wb); dividing by area (m^2) gives the SI unit of magnetic field B, which is the tesla, i.e. Wb/m^2.

Magnetic flux through an area is $\phi_B = B\cdot A$ (for B perpendicular to the area), measured in weber (Wb). Rearranging, the magnetic field (flux density) is

$B = \dfrac{\phi_B}{A}$

…

Magnetic field has magnitude and a specific direction at every point, making it a vector quantity, usually denoted $\vec{B}$.

The magnetic field at a point is characterised by both a strength (in tesla) and a direction (the direction a small compass needle would point, or the direction along which the force on a moving charge/dipole is calculated using $\vec{F} = q\vec{v}\times\vec{B}$). Because it obeys vector addition (field …

Weber per square metre is the SI unit of magnetic flux density B, i.e. the tesla.

Magnetic flux $\Phi$ is measured in weber (Wb), and magnetic flux density (magnetic field) $B = \Phi/A$ is measured in $\text{Wb m}^{-2}$ …