AQA GCSE Physics Paper 2 (Latest Update
) Questions & Answers {Grade
A} 100% Correct
When a current flows through a conducting wire... - correct answer a magnetic field is
produced around the wire. The strength of the magnetic field depends on:
- Size of current.
- The distance from the wire.
Corkscrew rule - correct answer The direction of the magnetic field around a current
carrying wire follows the direction you turn a corkscrew.
Solenoid - correct answer -A solenoid is a long coil of insulated wire.
-Shaping a wire to form a solenoid increases the strength of the magnetic field created
by a current through the wire.
-The field inside is strong and uniform.
Properties of a solenoid - correct answer -increases in strength as current increases.
- reverses if current is reversed.
,- increases in strength as you get closer to the wire.
- increases in strength with an iron core.
- outside the solenoid, has a similar shape to a bar magnet.
Electromagnet - correct answer A solenoid with a ferrous metal core.
Polarity of Solenoids - correct answer To work out the north and south end of a
Solenoid you look at the end of the solenoid, and see which direction the current is
going round.
If it is clockwise it is south, if it is going anticlockwise it is north.
Motor effect - correct answer When a conductor carrying a current is placed in a
magnetic field (produced by a different magnet), they exert a force on each other
called the motor effect.
Factors affecting size of force in motor effect - correct answer -Size of current.
- Strength of magnet.
,- Angle between the wire and the magnetic field lines. The force is greatest when the
wire is perpendicular to the magnetic field. There is no force if they are parallel.
Fleming's left hand rule - correct answer
Electric motors (motor effect) - correct answer 1. Coil placed in magnetic field
2. Coil experiences a force, rotating it
3.To keep the coil moving in one direction, a split ring commutator reconnects the two
sides of the coil every half-turn
Headphones/Speakers - correct answer 1.a current in the coil creates an
electromagnetic field
2.the electromagnetic field interacts with the permanent magnet generating a force,
which pushes the cone outwards
3.the current is made to flow in the opposite direction
4.the direction of the electromagnetic field reverses
, 5.the force on the cone now pulls it back in
6.repeatedly alternating the current direction makes the cone vibrate in and out (the
electric current must vary in the same way as the desired sound.)
7.the cone vibrations cause pressure variations in the air, which are sound waves
Generator effect - correct answer If an electrical conductor moves relative to a
magnetic field (cuts the magnetic field lines) a potential difference is induced across
the ends of the conductor. If this conductor is part of a circuit, a current is induced.
This induced current forms its own magnetic field that will resist the change that
induced it
Requirements for generator effect - correct answer 1.Relative Motion between field
and conductor (K.E. Input)
2.Magnetic Field
3.Conductor(s)
) Questions & Answers {Grade
A} 100% Correct
When a current flows through a conducting wire... - correct answer a magnetic field is
produced around the wire. The strength of the magnetic field depends on:
- Size of current.
- The distance from the wire.
Corkscrew rule - correct answer The direction of the magnetic field around a current
carrying wire follows the direction you turn a corkscrew.
Solenoid - correct answer -A solenoid is a long coil of insulated wire.
-Shaping a wire to form a solenoid increases the strength of the magnetic field created
by a current through the wire.
-The field inside is strong and uniform.
Properties of a solenoid - correct answer -increases in strength as current increases.
- reverses if current is reversed.
,- increases in strength as you get closer to the wire.
- increases in strength with an iron core.
- outside the solenoid, has a similar shape to a bar magnet.
Electromagnet - correct answer A solenoid with a ferrous metal core.
Polarity of Solenoids - correct answer To work out the north and south end of a
Solenoid you look at the end of the solenoid, and see which direction the current is
going round.
If it is clockwise it is south, if it is going anticlockwise it is north.
Motor effect - correct answer When a conductor carrying a current is placed in a
magnetic field (produced by a different magnet), they exert a force on each other
called the motor effect.
Factors affecting size of force in motor effect - correct answer -Size of current.
- Strength of magnet.
,- Angle between the wire and the magnetic field lines. The force is greatest when the
wire is perpendicular to the magnetic field. There is no force if they are parallel.
Fleming's left hand rule - correct answer
Electric motors (motor effect) - correct answer 1. Coil placed in magnetic field
2. Coil experiences a force, rotating it
3.To keep the coil moving in one direction, a split ring commutator reconnects the two
sides of the coil every half-turn
Headphones/Speakers - correct answer 1.a current in the coil creates an
electromagnetic field
2.the electromagnetic field interacts with the permanent magnet generating a force,
which pushes the cone outwards
3.the current is made to flow in the opposite direction
4.the direction of the electromagnetic field reverses
, 5.the force on the cone now pulls it back in
6.repeatedly alternating the current direction makes the cone vibrate in and out (the
electric current must vary in the same way as the desired sound.)
7.the cone vibrations cause pressure variations in the air, which are sound waves
Generator effect - correct answer If an electrical conductor moves relative to a
magnetic field (cuts the magnetic field lines) a potential difference is induced across
the ends of the conductor. If this conductor is part of a circuit, a current is induced.
This induced current forms its own magnetic field that will resist the change that
induced it
Requirements for generator effect - correct answer 1.Relative Motion between field
and conductor (K.E. Input)
2.Magnetic Field
3.Conductor(s)
