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 First take a straight thick copper wire and place it between the points X and Y in
an electric circuit, as shown in Fig. 1.

 Figure 1: compass needle is deflected when it is placed near a current carrying
wire
 Now we place a small compass near to this copper wire.
 After placing the needle note the position of its needle.
 Now insert the key into the plug to close the circuit and pass the current through
the circuit.
 Since the current is flowing in the circuit now observe the change in the position
of the compass needle.
In the above activity we observed that the needle of the compass gets deflected when it
is placed near the current carrying conductor. The result of this activity implies that
current flowing through copper wire is producing a magnetic effect.
Thus we can say that electricity and magnetism are linked to each other.

Who was Hans Christian Oersted?
Hans Christian Oersted (1777-1851) through his experiments showed that electricity
and magnetism are related to each other. His research later used in radio, television
etc.

Magnetic Effect of Current

What is a magnetic effect of Current?
Electricity and Magnetism are related phenomenon. When an electric current is passed
through metallic conductor, it generates a magnetic field around it.

The direction of the magnetic field depends on the direction of current which is
determined by SNOW rule or Ampere’s swimming rule.

SNOW rule states that if the current is flowing in an electric circuit from South to North
direction and the conducting wire is place over a magnetic compass , the needle of the
compass deflects in the direction of west.

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