Electromagnetism & The Motor Effect 12.2

These flashcards cover key concepts related to electromagnetism and the motor effect from the lecture notes.

What is produced around a wire when a current flows through it?

A magnetic field is produced around the wire.

What does the right-hand thumb rule indicate?

The direction of current flow through a wire and the direction of the magnetic field around the wire.

How does the strength of the magnetic field change with distance from the wire?

The magnetic field is strongest closest to the wire and gets weaker as the distance increases.

What happens to the magnetic field when there is no current flowing through the wire?

There will be no magnetic field produced around or through the wire.

How can the strength of the magnetic field produced by a solenoid be increased?

By increasing the size of the current, increasing the number of coils, or adding an iron core.

What is the result of placing a current-carrying wire in a magnetic field?

The wire experiences a force due to the interaction of the magnetic fields.

What does Fleming's Left-Hand Rule help to determine?

The direction of the force, magnetic field, and current in a current-carrying wire.

What is the equation for calculating the force on a current-carrying conductor in a magnetic field?

F = BIL, where F is force, B is magnetic flux density, I is current, and L is the length of the conductor.

What is the purpose of the split ring in a d.c. motor?

It connects the coil to the flow of current and allows it to rotate in a single direction.

What can increase the speed of rotation of a coil in a d.c. motor?

Increasing the current or using a stronger magnet.