GCSE PHYSICS - MAGNETISM AND ELECTROMAG - LESSON 17 - electromagnetic induction loop - part 1

Electromagnetic Induction Explained

Understanding Electromagnetic Induction

• Electromagnetic induction occurs when a conductor moves through a magnetic field, generating a voltage across the wire known as EMF (electro-motive force).

• The movement of the conductor through the magnetic field drives current around the circuit, causing an ammeter to indicate positive displacement.

• The direction of current flow is dependent on the direction in which the conductor moves relative to the magnetic field; reversing this movement reverses current direction.

Factors Affecting EMF and Current

• The size of the generated EMF and resulting current increases with higher speeds of the conducting loop moving through or towards the magnetic field.

• A stronger magnetic field also results in increased current; thus, both speed and intensity are crucial factors.

• Introducing more loops into a coil or solenoid enhances induced current; whether it’s the magnet entering or exiting does not affect directionality.

Key Principles for GCSE/IGCSE

• Changing the direction of either magnet or solenoid will change the direction of induced current, which is essential knowledge for exams.

• The speed at which a magnet enters/exits a solenoid directly influences generated current; faster movements yield greater currents.