Question

How can we say that magnetic field has both magnitude and direction ? Can anybody please explain to me ?

Answer 1

The magnetic field B is defined from theLorentz Force Law, and specifically from the magnetic force on a moving charge:The implications of this expression include:1. The force is perpendicular to both the velocity v of the charge q and the magnetic field B.2. The magnitude of the force is F = qvB sinθ where θ is theangle < 180 degrees between the velocity and the magnetic field. This implies that the magnetic force on a stationary charge or a charge moving parallel to the magnetic field is zero.3. The direction of the force is given by theright hand rule.The force relationship above is in the form of avector

Answer 2

The direction of magnetic field at a point is the direction of resultant force acting on a hypothetical north pole placed at that point...