The magnetic field due to a long straight wire would be: The μ~0 over 4π is just a constant. r is the distance from the center of the wire.

Since the compass is underneath the wire, the magnetic field due to the wire will be 90° to the Earth's magnetic field. Photo: ... it won't move in a straight line along the direction of the current.

I had cause to demonstrate the magnetic field around a wire, and ended up with an 8A current in a vertical wire, battling with the Earth’s magnetic field. My borrowed idea was to put a ring of eight ...

Faraday’s Law of Induction describes how an electric current produces a magnetic field and, conversely, how a changing magnetic field generates an electric current in a conductor.

The magnetic field around a single, straight piece of wire is fairly weak. Wrapping a bunch of wire into a tight coil, however, can make the magnetic field much stronger.

A coil of wire, or solenoid, consists of a wire coiled up into a spiral shape. When an electric current flows, the shape of the magnetic field is very similar to the field of a bar magnet. The ...

Dot Physics. Physics Problem; Magnetic Force on a Loop due to a Long Straight Wire. Posted: May 28, 2025 | Last updated: May 28, 2025. Physics and Python stuff.

When Our Magnetic Field Flips. By Rick Groleau; Posted 11.18.03; NOVA; Every so often—every 250,000 years on average—the Earth's magnetic poles reverse polarity.

Why does Earth have a magnetic field? Earth's main magnetic field is generated in the planet's outer core, a layer of molten iron 2,2001,800-3,100 miles (2,890-5,000 kilometers) below the planet's ...

Magnetic fields are everywhere in the universe. Of course, there's Earth's magnetic field, which deflects dangerous cosmic radiation, wiggles our compasses, and guides flocks of migrating birds ...