What does a changing magnetic field causes?
A changing magnetic field induces a current in a conductor. For example, if we move a bar magnet near a conductor loop, a current gets induced in it. The E.M.F. E induced in a conducting loop is equal to the rate at which flux ϕ through the loop changes with time.
What happen when a block of metal is kept in a varying magnetic field?
When a block of metal is kept in a varying magnetic field then Eddy current is produced. An eddy current is a current set up in a conductor in response to a changing magnetic field. They flow in closed loops in a plane perpendicular to the magnetic field.
How can we change magnetic field?
The change could be produced by changing the magnetic field strength, moving a magnet toward or away from the coil, moving the coil into or out of the magnetic field, rotating the coil relative to the magnet, etc. Faraday’s law is a fundamental relationship which comes from Maxwell’s equations.
What is meant by changing magnetic field?
This means that the magnetic field is building up and collapsing constantly in the circuit. In other words, it is producing a changing magnetic field over time.
How do you interrupt an electromagnetic field?
The simple answer is that it is not possible to totally ‘block’ a magnetic field. The essence of a magnet, as determined by nature, is that magnetic field lines must terminate on the opposite pole and, therefore, there is no way to stop them.
Can magnets attract through aluminum?
In our everyday experience aluminum doesn’t stick to magnets (neither does copper). Most matter will exhibit some magnetic attraction when under high enough magnetic fields. But under normal circumstances aluminum isn’t visibly magnetic.
Which direction does a freely suspended compass point to?
North-South direction
Why does a freely moving needle of a compass always point to the North?
A compass needle points north because the north pole of the magnet inside it is attracted to the south pole of Earth’s built-in magnet. Since unlike poles attract, the thing your compass is being attracted to must be a magnetic south pole.