State the rule to determine the direction of a force experienced by a current carrying straight conductor placed in a magnetic field which is perpendicular to it.

In the diagram given, a coil ‘P’ is connected to a torch bulb and placed parallel to another coil ‘Q’ as shown in figure:
 

Explain the following observation:

(i) Bulb lights.

In the diagram given, a coil ‘P’ is connected to a torch bulb and placed parallel to another coil ‘Q’ as shown in figure:
  
Explain the following observations:

Bulb gets dimmer if the coil P is moved upwards.

State Fleming’s left-hand rule. Apply this rule and find the direction of force acting on the electron that enters a magnetic field at right angles to it as shown in the figure.