- observe that steel nail retains some magnetism when it is previously stuck to magnet for a very long time.
- process is known as proximity induced magnetism
- can take place when magnetic material is in contact or in close proximity to a strong magnet
→ only magnetic materials can be magnetised
Definition
Induction, or induced magnetism can take place when a magnetic material is placed close to a strong magnet or within a current carrying solenoid #PhysicsDefinitions
magnetic material can be magnetised when it is stroked with a strong magnet.
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unmagnetized steel bar is stroked with 1 pole of a magnet repeatedly. same pole must be used throughout
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the magnet must be lifted sufficiently high above the bar after each stroke. an opposite pole will be induced at the end where the magnet leaves the steel bar.
current carrying solenoid produces a magnetic field similar to that of a bar magnet.
Definition
Magnetic field is a region in which the force of magnetism acts #PhysicsDefinitions
by placing a magnetic material → such as iron rod → inside the current carrying solenoid → the magnetic material becomes a magnet.
direction of magnetic field produced by a solenoid → can be determined → using the right hand grip role.
- known as corkscrew rule as well → used to show relationship between current and magnetic field.
to determine direction of magnetic field when current flows through solenoid → imagine gripping solenoid with right hand.
Important
Rod inside solenoid → will get magnetised with the same polarity as the solenoid’s polarity
Important
magnetic induction is a process where a non magnet is turned into a magnet using an applied magnetic field The magnetic field can be that of a strong magnet or within a current carrying solenoid