How to determine the direction of the magnetic field lines? Use the Right-Hand Rule!
What is the direction of the magnetic field line?
The direction of the magnetic field line is to indicate the direction of the magnetic field.
The direction of the magnetic field is the direction of the N-pole of the small magnetic needle at this location, when the non-magnetic needle is located on the outside of the bar magnet, the n-pole of the magnetic needle points to the S-pole of the magnet under the action of magnetic force. The direction of the magnetic field at the location where the magnetic needle is placed is the reason for pointing from N to S.
The magnetic lines of force are closed curves drawn to understand the magnetic field distribution artificially.
The magnetic lines of force outside the magnet come out of the n-pole and return to the s-pole of the magnet, and inside it is S-pole to N-pole, the external magnetic lines of force are curved, and the internal magnetic lines of force are straight.
The respective magnetic lines of force are closed curves, and any 2 magnetic lines of force do not intersect.
The direction of the tangent line at each point on the induction line indicates the direction of the magnetic field.
The sparsity of the lines of induction indicates the magnitude of the magnetic induction.
The direction of the earth’s magnetic lines of force is the same as the direction of the magnetic lines of force of a bar magnet.
How can the direction of the magnetic induction lines and the direction of the magnetic field be determined?
A current makes the magnetic field in a straight wire curled around the wire in a ring. The direction of the force due to a magnetic field is perpendicular to the direction of motion.
You can find it by pointing your right thumb toward the current in the wire and curling your fingers. Your fingers will be curled in the same direction as the magnetic field around the wire.
Is the direction of the magnetic field the same as the direction of the magnetic lines of induction?
The magnetic field is an objectively existing substance; it is not a variable.
The direction of magnetic lines of force is a variable referred to as field strength and is represented by the symbol B. Field strength is a vector quantity with a magnitude and a direction. In terms of direction, we use the abstract, human-defined concept of magnetic induction lines to depict the direction of field strength, so the direction of field strength at a point is the direction of the tangent line of magnetic induction. Regarding your question, the direction of field strength and magnetic induction is the same.
If it is a uniform magnetic field, the direction of the magnetic field is the same as the direction of the magnetic inductance; if it is a non-uniform magnetic field, the direction of the magnetic field is different at each point, but the direction of the magnetic field at any point is the direction of the tangent to the magnetic inductance at that point.
How to determine the direction of the magnetic field and magnetic induction magnetic field direction that is the direction of magnetic induction, the determination method is to put into test the direction of the magnetic field force on the small magnetic needle, but also the direction of the small magnetic needle when it is in stable equilibrium.
The direction of magnetic lines of force is (B)
(1) Definition: in the magnetic field perpendicular to the direction of the magnetic field of the energized wire, the magnetic field force F and the current strength I and the product of the length of the wire L IL ratio, called the energized wire where the magnetic induction strength, expressed in B.
(2) Formula: B = F / (I – L)
(3) Vector: The direction of B is the same as the direction of the magnetic field, i.e., the direction of the force on the N pole of the small magnetic needle.
(4) Unit: Tesla (T) 1T = 1N/(A-m), that is, the perpendicular magnetic field placed in the direction of the 1m long wire, the current is 1A, if the magnetic field force of 1N, the magnetic induction B is 1T.
Available permanent magnet magnetic induction near the poles is about 0.4T-0.7T; motor and transformer core, magnetic induction of 0.8T ~ 1.4T, and the magnetic induction of the ground near the geomagnetic field are about 0.5 × 10-4T.
How to determine the direction of the magnetic field? Use the Right-Hand Rule!
The most direct method is using the Right-Hand Rule!
Put a small magnetic needle in the magnetic field, then the direction of the N pole of the needle is the direction of the tangent of the magnetic induction line at that point
The direction of the magnetic field of a straight wire:
Hold the straight wire in your right hand, let your thumb point in the same direction as the current, and the other four fingers are naturally bent, then the direction of the bending of the four fingers is the direction of the magnetic field of induction
Coil magnetic field:
Similar to the above method, but with four fingers bent in the same direction as the current, the thumb straight, the direction of the thumb is the direction of the magnetic field of induction.
Rules for Determining the Direction of the Magnetic Field
The following are examples of straight lines, loops, and solenoids, how to determine the direction of the magnetic field lines.
The direction of the magnetic field around the linear current
Hold the wire with the right hand so that the direction of the straight thumb is the same as the direction of the current, and the direction of the four fingers bent is the direction of magnetic induction lines around.
The direction of the magnetic field of the toroidal current
Let the right hand bend the four fingers, and the direction of the toroidal current in line with the direction of the straightened thumb is the direction of the magnetic field of induction on the central axis of the toroidal wire.
The direction of the magnetic field of the energized solenoid
Hold the solenoid with the right hand so that the direction of the bent four fingers and the direction of the current is the same, the direction of the thumb is the north pole of the solenoid (the direction of the magnetic induction inside the solenoid.
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