Consider a circular loop of wire. Let the current pass through the loop clockwise. With the help of a diagram explain how the direction of the magnetic field can be determined inside and outside the loop. Name the law used to find the direction of magnetic field.

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.