Lect14
... At point A: dl is to the right, and r is up dB is out of the page At point B: dl is to the right, and r is up and right dB is out of the page At point C: dl is to the right, and r is down and right dB is into the page For every point in the x-y plane and every piece of wire dl: every dl and ev ...
... At point A: dl is to the right, and r is up dB is out of the page At point B: dl is to the right, and r is up and right dB is out of the page At point C: dl is to the right, and r is down and right dB is into the page For every point in the x-y plane and every piece of wire dl: every dl and ev ...
Electromagnetic Testing (ET)
... • Only good on conductive materials (not on magnetic materials) • Extensive skill and training required for interpretation of results • Surface finish or build-up may interfere with test results • Need reference standards for set-up • Limited depth of penetration ...
... • Only good on conductive materials (not on magnetic materials) • Extensive skill and training required for interpretation of results • Surface finish or build-up may interfere with test results • Need reference standards for set-up • Limited depth of penetration ...
Magnetic Filed due to Electric Current
... •As the length of the solenoid increases, – The interior field becomes more uniform. – The exterior field becomes weaker. ...
... •As the length of the solenoid increases, – The interior field becomes more uniform. – The exterior field becomes weaker. ...
Disputes exist in Electromagnetic Induction
... was produced in the conductor or in free space? In 1892, Lorentz created a metal electronic theory, for this reason the metal electron caused the induced current under Lorentz magnetic force, in which the nature is force F instead of field. In essence, whether coil motion or magnet motion, as long a ...
... was produced in the conductor or in free space? In 1892, Lorentz created a metal electronic theory, for this reason the metal electron caused the induced current under Lorentz magnetic force, in which the nature is force F instead of field. In essence, whether coil motion or magnet motion, as long a ...
Sea-Floor spreading
... • Outer core of the Earth The molten iron flows creates an electric current (flow of electrons) & a magnetic field that surrounds the planet. • The magnetic field created in the center of the planet makes your compass point north • Protects the Earth from solar winds. ...
... • Outer core of the Earth The molten iron flows creates an electric current (flow of electrons) & a magnetic field that surrounds the planet. • The magnetic field created in the center of the planet makes your compass point north • Protects the Earth from solar winds. ...
Lunar Magnetic Anomalies
... • Unlike Earth, the moon now has no global magnetic field • However, small spot-like magnetic fields are detected by lunar satellites – lunar magnetic anomalies • Anomalies suggest remanent magnetisation of lunar crust à Possibly caused by an ancient dipolar magnetic field 3-4 billion years ago ...
... • Unlike Earth, the moon now has no global magnetic field • However, small spot-like magnetic fields are detected by lunar satellites – lunar magnetic anomalies • Anomalies suggest remanent magnetisation of lunar crust à Possibly caused by an ancient dipolar magnetic field 3-4 billion years ago ...
Superconducting magnet
A superconducting magnet is an electromagnet made from coils of superconducting wire. They must be cooled to cryogenic temperatures during operation. In its superconducting state the wire can conduct much larger electric currents than ordinary wire, creating intense magnetic fields. Superconducting magnets can produce greater magnetic fields than all but the strongest electromagnets and can be cheaper to operate because no energy is dissipated as heat in the windings. They are used in MRI machines in hospitals, and in scientific equipment such as NMR spectrometers, mass spectrometers and particle accelerators.