The strength of the magnetic field around a wire is greatest closest to it. Fleming's left hand rule shows that changing the direction of the current in a straight wire or a solenoid reverses the ...

The magnetic field around a single wire is very weak. Coiling the wire around an iron core increases the strength of the electromagnet by concentrating the magnetic field. In this activity campers ...

To investigate, describe and recall how the strength of the magnetic ... by the current flowing in the wire. The bigger the current the stronger the magnetic field and hence the stronger the ...

The simplest use coils of wire which, when passed through a ... gases to measure changes in magnetic field strength and direction. Early spacecraft typified some of these differences.

It’s something [mircemk] demonstrates, with an Arduino-powered magnetic field strength meter that uses a UGN 3503U Hall effect device. The circuit is extremely simple, comprising the sensor ...

Merging some esoteric physics principles with an advanced instrument creates a magnetic microscope with resolution better ...