Electric Current Effects in Metallic Wires
When an electric current flows through a metallic wire, it generates a phenomenon governed by the principles of electromagnetism.
Specifically, moving electric charges (the current) create a magnetic field in the space surrounding the conductor. This observation is a fundamental concept in physics, notably demonstrated by Hans Christian Ørsted.
Magnetic Field Generation
The presence of this magnetic field is a direct consequence of the electric current. The field exists in the region around the wire, extending outwards.
Evaluation of Options
- No physical effect: This is incorrect. Current flow causes observable effects.
- A magnetic field around it: This is the key electromagnetic effect directly caused by the current's flow.
- Only electric potential: Electric potential is related to the cause of the current, not the primary effect of the current itself in motion.
- Only heat: While heat (Joule heating) is generated due to resistance, the magnetic field is another distinct and fundamental association.
Therefore, the most accurate association with a metallic wire carrying an electric current is the generation of a magnetic field around it.
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:
