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- https://phys.libretexts.org/Bookshelves/College_Physics/College_Physics_1e_(OpenStax)/22%3A_Magnetism/22.09%3A_Magnetic_Fields_Produced_by_Currents-_Amperes_LawThe strength of the magnetic field created by current in a long straight wire is given by B=μ0I2πr(longstraightwire), where I is the ...The strength of the magnetic field created by current in a long straight wire is given by B=μ0I2πr(longstraightwire), where I is the current, r is the shortest distance to the wire, and the constant μ0=4π×10−7T⋅m/a is the permeability of free space. The direction of the magnetic field created by a long straight wire is given by right hand rule 2 (RHR-2): Point the thumb of the right hand in the d
- https://phys.libretexts.org/Courses/Grand_Rapids_Community_College/PH246_Calculus_Physics_II_(2025)/08%3A_Sources_of_Magnetic_Fields/8.06%3A_Magnetism_in_Matter/8.6.01%3A_MagnetsThere are two type of magnets—ferromagnets that can sustain a permanent magnetic field, and electromagnets produced by the flow of current.
- https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/21%3A_Magnetism/21.2%3A_MagnetsThere are two type of magnets—ferromagnets that can sustain a permanent magnetic field, and electromagnets produced by the flow of current.
- https://phys.libretexts.org/Bookshelves/Electricity_and_Magnetism/Electricity_and_Magnetism_(Tatum)/09%3A_Magnetic_Potential/9.04%3A_Long_SolenoidIn that case, we already know that the field inside the solenoid is uniform and is μnIˆz inside the solenoid and zero outside. Now, as everybody knows, the surface integra...In that case, we already know that the field inside the solenoid is uniform and is μnIˆz inside the solenoid and zero outside. Now, as everybody knows, the surface integral of a vector field across a closed curve is equal to the line integral of its curl around the curve, and this is equal to 2πrAϕ.
- https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/22%3A_Induction_AC_Circuits_and_Electrical_Technologies/22.1%3A_Magnetic_Flux_Induction_and_Faradays_LawFaraday’s law of induction states that an electromotive force is induced by a change in the magnetic flux.
- https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Introductory_Physics_II_(1112)/07%3A_Magnetism/7.10%3A_Magnetic_Fields_Produced_by_Currents-_Amperes_LawThe direction of the magnetic field created by a long straight wire is given by right hand rule 2 (RHR-2): Point the thumb of the right hand in the direction of current, and the fingers curl in the di...The direction of the magnetic field created by a long straight wire is given by right hand rule 2 (RHR-2): Point the thumb of the right hand in the direction of current, and the fingers curl in the direction of the magnetic field loops created by it. a rule to determine the direction of the magnetic field induced by a current-carrying wire: Point the thumb of the right hand in the direction of current, and the fingers curl in the direction of the magnetic field loops
- https://phys.libretexts.org/Courses/University_of_California_Davis/UCD%3A_Physics_9C__Electricity_and_Magnetism/4%3A_Magnetism/4.4%3A_Sources_of_Magnetic_FieldsNow that we know the basic cause of magnetic fields, we will practice calculating these fields, and will look at some common sources.
