Question

a) What is meant by a ‘magnetic field’?

b) How is the direction of magnetic field at a point determined?

c) Describe an activity to demonstrate the direction of the magnetic field generated around a current carrying

conductor.

d) What is the direction of magnetic field at the centre of a current carrying circular loop?​

Answer 1

Explanation:

a).a region around a magnetoc material witchin which force of magnetism can ve detected

b).direction of magnetic field at a point is determined by placing a small compass neddle. the pole indicates the direction of magnetic field at that point

C).Current is generally defined as the rate of flow of charge. We already know that stationary charges produce an electric field which is proportional to the magnitude of the charge. The same principle can be applied here, moving charges produce magnetic fields which are proportional to the current and hence a current carrying conductor produces magnetic effect around it. This magnetic field is generally attributed to the sub-atomic particles in the conductor, for e.g. the moving electrons in the atomic orbitals.

Magnetic field has both magnitude and direction. Hence it is a vector quantity and is denoted by B (in the diagram given below). Magnetic field due to a current carrying conductor depends on the current in the conductor and distance of the point from the conductor. The direction of the magnetic field is perpendicular to the wire. If you wrap your right hand’s fingers around the wire with your thumb pointing in the direction of the current, then the direction in which the fingers would curl will give the direction of the magnetic field. This will be clearer with the diagram shown below where the red lines represent the magnetic field lines.

d). At the centre of the circular loop, The magnetic field lines are straight.

Each segment of circular loop carrying current produces magnetic field lines in the same direction with in the loop.

The direction of magnetic field at the centre of circular coil is perpendicular to the place of the coil. i.e. along the axis of the coil.