Give the definition of $1\, T$ (Tesla) magnetic field.

(N/A) The magnetic field is said to be $1\, T$ if a charge of $1\, C$ moving with a velocity of $1\, m/s$ perpendicular to the magnetic field experiences a magnetic force of $1\, N$.
This is derived from the Lorentz force formula: $\vec{F} = q(\vec{v} \times \vec{B})$.
In magnitude,$F = qvB \sin(\theta)$.
Setting $F = 1\, N$,$q = 1\, C$,$v = 1\, m/s$,and $\theta = 90^\circ$ (where $\sin(90^\circ) = 1$),we get:
$1 = 1 \times 1 \times B \times 1$
$B = 1\, T$.