Before we study magnetic effects of electric current,
let's study what is electric current and its different effects
What is Electric Current?
We have studied in Last Chapter that
Electric Current is the flow of electric Charges in a Conductor
What are its Different Effects of Electric Current
Electric Current has 2 Main Effects
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Heating Effect of Electric Current
This we have already studied in last chapter that when an electric current passes through a conductor (like a high resistance wire),
the conductor becomes hot after some time and produces heat
This is called heating effect of Electric Current
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Magnetic Effect of Electric Current
When an electric current flows through a circuit, it produces a magnetic field around it
This is called Magnetic Effect of Electric Current
Activity to Show Magnetic Effect of Electric Current
Let's follow these steps
- Make Electric Circuit Containing Battery and Copper Wires
- Place a Magnetic Compass Near it
- Now, close the circuit to make the current flow
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We observe that, Magnetic Compass shows deflection
This deflection is due to Magnetic Effect of Electric Current - Now, lets reverse the flow of current
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Now, the Electric Compass shows deflection in opposite direction
So, as direction of current changes, direction of magnetic field changes - Now, if we increase distance of magnetic compass from current,
-
The Electric Compass deflects less than before
Thus, magnetic field becomes less as we move away from the wire
A video explanation is given below
What is Electromagnetism
It is branch of physics which studies phenomena of Electrical Current and Magnetic Fields
This phenomena was accidentally discovered by Hans Christian Oersted
He saw deflection of Magnetic Compass placed near wire through which current was passed
Unit of Magnetic Field Strength is Oester which is named after him.
Important Points About Magnetic Effect of Electrical Current
Magnetic Effect Depends upon Amount of Current Passing in Wire
More the current passing in wire, more the electromagnetic effect
Less the current passing in the wire, less the electromagnetic effect
Magnetic Effect Depends upon Distance from the wire
If we move away from the wire, the magnetic field decreases
Magnetic Effect of Electrical Current Depends Upon Type of Conductor(Wire)
In Electric Circuit we can use different types of Wires (or Conductors).
Different types of Conductors are
- Straight Conductor (Straight wire)
- Circular loop (Circular Wire) and
- Solenoid (Long coil of wire)
Let's study these one by one
