Compass Needle Deflection Discovery
The discovery that an electric current creates a magnetic field was a pivotal moment in physics. This phenomenon was observed when a compass needle, placed near a wire carrying electric current, showed a deflection.
Oersted's Observation
In 1820, physicist Hans Christian Oersted noticed this effect during a lecture demonstration. He observed that the compass needle deflected whenever he switched the electric current on or off in a nearby wire.
Significance of the Discovery
This observation demonstrated a direct link between electricity and magnetism, laying the groundwork for the field of electromagnetism. The deflection indicated that the electric current flowing through the wire produced a magnetic field around it, capable of influencing the compass needle.
Conclusion
Hans Christian Oersted is credited with noticing the deflection of the compass needle whenever current was passed through the wire. This finding was fundamental to understanding the relationship between electrical currents and magnetic fields.
Important Questions from Magnetism
How many of the following materials can be attracted by a magnet?
1. Plastic
2. Carbon
3. Aluminium
4. Stainless Steel
Select the correct answer using the code given below:
What will happen if a collection of positive and negative charges are passed at a high speed through a magnetic field which is perpendicular to the direction of motion of the charges? (Assume that both kind of charges are NOT going to recombine)
Which scientist suggested that the magnet must also exert an equal and opposite force on the current-carrying conductor?
Paramagnetic substances are-
The magnetic field lines produced inside a long current-carrying solenoid is similar to that of a:
