Answer:
Explanation:
1. If the charge is stationary and it is not moving, then the magnetic force will be zero, since the velocity is 0m/s
From the formula of magnetic force
F = q(V×B)
And since V is 0, then, the magnetic force is zero
F = 0N,
No torque at all.
2. The moving charge interacts with the fixed magnet. The force between them is at a maximum when the velocity of the charge is perpendicular to the magnetic field.
From the formula of magnetic force
F = q( V×B)
V × B = |V|•|B| Sinθ
So, Sinθ has its highest value at 90° in the range of 0-360°
So, the force will have a maximum value when the moving charge is perpendicular to the magnetic field
Now, since the magnetic field is in the positive y-direction, for the force to be maximum the electron must move the positive x-direction.
So the force will be in the positive z-direction(since i×j= k).
3. Now, the charge is replaced by an electrically neutral piece of initially unmagnetized soft iron (e.g. nail) that is not moving. This result into the magnetic experience a force due to the iron fillings attracting its north pole.
