Validation Practise Cards For Electromagnetism Flashcards
Connection between electricity and magnetisim
a changing electric field creates a magnetic field, and a changing magnetic field creates an electric field
if you put more current in a wire what do you get?
there is more magnetic field because it the current thats making the magnetic field
If you increase the strength of the current what happens to the deflection in the compass?
The compass is deflected more .Meaning that the magnetic field got stronger
deflection angle of the compass needle is directly proportional to the magnitude of the current
the deflection of the compass or the wire is maximum when close to the wire but is weak when away from the wire with current why?
the magnetic field is very strong close to the wire and weak away from the wire.
field weaknes with more distance
what was the purpose of the investigation?
To find how the magnetic field produced by a current in a long straight wire depends on the current in the wire and the distance from the wire
Earths magnetic field in relation to a current carrying conductor
The earth’s magnetic field can be considered uniform and constant at any point in the earth’s surface.If the field are perpendiicular then they will combine and a compass will point in the direction of the resultant
Bi/Be =tan 0
Furthermore
the mag field due to the current in a long straight wire has a direction perpendicular to the wire and in a horizontal plane directly beneath the wire .
what does a current carrying wire do?
It produces a magentic field around the wire .You can use the formula the image below
If current is increased what happens to the Compas pointer?
the deflection angle also increases
what happens if the dircetion of the current is reversed in a current carrying wire?
The magnetic needle deflection is also reversed
Hypothesis for same direction of current when compass is placed top or bottom.
Needle deflections are opposite ,when placed at beneath and top (Cause field direction rotates in the wire thus magnetic needle aligns in the direction of magnetic field)
what does a compass do when two magnetic fields are placed closer together i.e(earths mag field and current carrying conductor mag field)
it figures out the overall magnetic field or the resultant MAGNETIC field
in the experiment why are wooden stands used in this investigations
1.Provide electrical insulation,
- prevent magnetic interference, (wood is non magnetic and does not interfere with the magnetic field created by the wire )
In the experiment why is the rest of the circuit setup well clear of the long straight wire?
- minimise Interference ;Keeping the rest of the circuit away from the long straight wire helps minimize any interference that could affect the magnetic field around the wire.
- Nearby components of the circuit could introduce inductive coupling, where changing magnetic fields induce currents in adjacent conductors. This could distort the observations and measurements related to the primary wire.
- ciruits produces magnetic fields ,electrical current and height which could potentiall affect the results of the experiments
variable that was kept constant in the wire
THe thickness of the wire :By keeping the wire thickness constant, any changes in the magnetic field can be directly attributed to changes in current, rather than variations in the physical properties of the wire.
Thicker wires have lower electrical resistance compared to thinner wires. Lower resistance allows more current to flow for a given voltage, which can affect the magnetic field strength.
