Question

Determing direction of force on charge moving in magnetic field

Answer 1

Emperate was the first person to show that the current experienced forces were taken when the stars were placed in magnetic fields. Later it was shown that the charged particles running in magnetic fields also felt the force. The common applications of these incidents are electric motor, galvanometer, and cathodere tube. Since a moving electrical charge is equal to current, we will first consider the force acting on the charge cue running with Velocity V in the magnetic field on the induction B. Experiment shows that the force F on the charge c is at the right angle, both V and B's instructions give it a basic distinction between two magnetic field waiter band H. We have already shown that the magnetic intensity on the magnetic pole on the rest is determined by H. We have seen that running is the charge and the currents generate H. The connection between magnetic induction B and magnetic intensity H is given in equation (29-15A)

B = F.μH, --------------------- 1

Where f.μ is the permeability of the medium.

Force F on induction B is moving forward with velocity v in the field of induction B. is given by

F = K3 QV × B ------------------------ 2

The force is perpendicular to the plane formed by Vector V and B and the Vector is guided by the right hand rule for the product. Continuous 3 proportionality is continuous, which is assigned value unity in system system of units. Thus, if force is expressed in F Newton, then the charge Q can be rewritten in kilograms, velocity v in meters per second, and magnetic induction B in Weber per square meter, equation (2).

F = QV × B ------------------------ 3

We can consider the equation (3) as the definition of B. From the above equation we see that if VB is parallel, then the force on the moving charge is zero. It suggests a method of determining the direction of B using cathode-ray tubes. If the charge of 1 kwal perpendicular to the power of 1 NT, in the field with speed of 1 M / sec, then 1 weber / m2 is induced in the field.