So the magnetic field outside the solenoid
will be really low and almost negligible
. Note: For a very long solenoid the magnetic field outside will be zero and magnetic will be present only inside the solenoid.
Do solenoids have magnetic fields?
In physics, the term solenoid refers to a long, thin loop of wire, often wrapped around a metallic core, which produces a
magnetic field
when an electric current is passed through it. Solenoids are important because they can create controlled magnetic fields and can be used as electromagnets.
Could a solenoid suspended by a string be used as a compass?
If a solenoid were suspended by a string so that it could rotate freely, could it be used as a compass when it carried a direct current? Yes,
the North Pole of the solenoid would point to earths
geographic North Pole; no, the solenoid would oscillate back and forth as it’s poles continually reverse.
Can a solenoids magnetic field be reversed?
The solenoid itself is simply a coil of wire with no directional components (e.g. a diode), so
it can simply be reversed in the circuit to generate the magnetic field in the opposite direction
, or you can reverse the direction of the current traveling through the solenoid.
What affects the magnetic field of a solenoid?
The magnetic field within a solenoid depends upon
the current and density of turns
. The energy density of the magnetic field depends on the strength of the field
Where the magnetic field of a solenoid is strongest?
The magnetic field is strongest
inside the coil of
a solenoid.
Why magnetic field is weak outside solenoid?
Magnetic field lines only exist as loops, they cannot diverge from or converge to a point like electric field lines can (see Gauss’s law for magnetism). … However, the volume outside the solenoid is much greater than the volume inside, so
the density of magnetic field lines outside is greatly reduced
.
What happens if a solenoid is wired backwards?
What happens if starter wires are backwards? When reversing the wires,
most starters change the fields to cause the motor to spin in the same direction
. It is difficult to connect the positive wire from the battery to the negative of the starter, so you have to make a short circuit.
What will happen when the direction of current in the solenoid is reversed?
If the current in a solenoid is reversed in direction while keeping the same magnitude,
the magnetic field energy stored in the solenoid decreases
.
Which rule is used in solenoid?
An
electric current passes through a solenoid
, resulting in a magnetic field. When you wrap your right hand around the solenoid with your fingers in the direction of the conventional current, your thumb points in the direction of the magnetic north pole.
How do you calculate the force of a solenoid?
The force is
F=A *B^2/2*mu_knot
. For a traditional solenoid, a common expression for magnetic field is: B=Bsol=mu_knot*N*I/g, where g = gap. Then, F=mu_knot*A*(NI/g)^2/2 [same as your equation, without NdFeB.]
What are the factors affecting solenoid?
The four main factors that affect the strength of an electromagnet are
the loop count, the current, the wire size, and the presence of an iron core.
How do you find the magnetic field inside a solenoid?
Ans: The magnetic field due to the solenoid formula is as follows,
B = μ0 (NI/l) or B = μ0nI
. In both cases the number of turns is directly proportional to the magnetic field, thus by increasing or by doubling the number of turns it directly affects the magnetic field and it increases.
What is the magnetic field at the center of a solenoid?
The magnetic field inside a solenoid is
proportional to both the applied current and the number of turns per unit length
. There is no dependence on the diameter of the solenoid, and the field strength doesn’t depend on the position inside the solenoid, i.e., the field inside is constant.
What is the magnetic field at the ends of the solenoid?
The magnetic field at the ends of a very long current carrying solenoid is
half of that at the centre
.
Where is the magnetic field weakest in a solenoid?
The field inside a solenoid is strong and uniform. The small magnetic fields caused by the current in each coil add together to make a stronger overall magnetic field.
Outside the solenoid
, the small magnetic fields from each wire cancel each other out and the outside field is much weaker.
