Magnetism and Electromagnetic Principles

What happens when unlike poles of two magnets are brought close to each other?

• They have no effect on each other.

• They attract each other.

• They repel each other.

• They create a new magnetic field.

What is the shape of the magnetic field around a bar magnet?

• Circular

• Rectangular

• Asymmetrical with field lines from south to north

• Symmetrical with field lines from north to south

What is created when a current flows through a conductor?

• A thermal field

• A gravitational field

• A magnetic field

• An electric field

What is a solenoid?

• A permanent magnet

• A type of battery

• A coil of wire that can carry a current

• A single straight wire

Which rule helps determine the direction of the magnetic field around a conductor?

• Fleming's right-hand rule

• Fleming's left-hand rule

• Right-hand rule

• Left-hand rule

What does Fleming's left-hand rule help predict?

• The direction of the current

• The direction of the electric field

• The direction of the magnetic field

• The direction of the force on a conductor

What is the motor effect used for?

• Heating elements

• Producing movement in motors

• Creating sound waves

• Generating electricity

What happens when a conductor moves relative to a magnetic field?

• A potential difference is induced

• A thermal difference is induced

• A chemical reaction occurs

• A gravitational difference is induced

What is the main difference between an alternator and a dynamo?

• An alternator is used in loudspeakers, while a dynamo is used in transformers

• An alternator produces DC, while a dynamo produces AC

• An alternator produces AC, while a dynamo produces DC

• An alternator is used in motors, while a dynamo is used in generators

What is the purpose of a transformer in the National Grid?

• To generate electricity

• To convert AC to DC

• To change the current and potential difference

• To store electrical energy