Q4 Examination Flashcards
Magnets have a North pole and a South pole
All
Surrounding every magnet is a
Magnetic Field
When two (2) magnetic North poles are brought close to each other, they will?
Repel
When a magnetic South pole is brought close to a magnetic North pole, the magnets will?
Attract
How is a bar magnet and Earth similar?
They both produce a magnetic field
South pole of Earth’s magnetic field is?
Near the geographic North pole
Happens if you cut a bar magnet in half
You get two smaller magnets, each with a North and South pole
Methods to demagnetize a ferromagnet
By heating, hammering, and spinning it in external magnetic field
NOT a method to demagnetize a magnet
Rubbing the magnet with a piece of cloth
The directional lines present inside and outside the magnetic material that indicate the magnitude and direction of the magnetic force
A magnetic field
The direction of the magnetic field lines outside a magnet
North pole to South pole
If two pieces of broken magnets are brought closer to each other
May attract or repel
A freely suspended bar magnet rests in
North-south directions
Magnetic poles will always occur
In pairs
What is true about magnetic fields?
They travel from north to south
In the region just outside the south pole of a magnet
Point away from the south pole
The diagram shows the field lines around a bar magnet
They point in the direction of the earth’s south pole
Like poles of a magnet_______, unlike poles _________
Repel, Attract
Correct about compass needles
Compass needles will point in a north-south direction
Force of magnetism is stronger when magnets are
Closer together
The force of attraction the strongest on a magnet
At the poles
Magnetic field strength is
Strongest close to a magnet
True about the force between the broken pieces if they face each other with a small separation
There is a magnetic attractive force between the broken pieces
Wrong statement
Magnetite does not show magnetic properties
Maximum iron filings stick (at the)
Ends
Electric current can best be induced in a wire by
Setting the wire near a magnet
A device consisting of a coil that is mechanically rotated in a stationary magnetic field
Transformer
A device that transforms electrical energy to mechanical energy
Generator
Electromagnetic induction
The production of an electric current created by a varying magnetic field
Effect produced on the coil after a short time
There is no effect
True or False:
All planet are have magnetic fields
False
True or False:
The earth large magnet…
True
True or False:
The earth are magnetic fields are wicked north and south
False
True or False:
When a bar magnet fall has 1 pole
False
True or False:
Magnet made in iron in which all the electron spinning in the same direction
True
True or False:
Magnets attracts metals
False
True or False:
Magnetism of life repel each other
True
True or False:
Electricity are the same
True
True or False:
In a magnet stronger in…
True
True or False:
Magnets only have one shape pole show magnet
False
True or False:
Electronic magnetic induction is use to application and inductor
True
True or False:
An electric generator…
True
True or False:
An electro magnetic induction is phenomenon a nearby conduction
True
True or False:
A changing magnetic fields produce a current
True
True or False:
There’s a magnetic field there is a current due to it…
False
