Physics- P7 Part C 0.0 / 5 ? PhysicsMagnetism and ElectromagnetismGCSEAQA Created by: 13clarkenCreated on: 31-05-18 10:57 28453176 Across 1. ... use an alternating current which is sent through a wire at the base of the cone. As poles are surrounded, a force is caused on the coil which moves the cone. A reversed current, causes a force in the opposite direction (12) 4. ... uses dc current. A current-carrying coil of wire rotates in a magnetic field. It rotates because its on a spindle, the force acting on spindle makes it turn. Motor rotates in the same direction because split ring commutator make current flow same (8, 6) 5. To change the size of the ... PD: -Increase speed of movement- cutting more magnetic field lines in same time. -Increase strength of magnetic field- more field lines to be cut (7) 6. Force acting on a ... (something carrying a current) in a magnetic field depends on: Magnetic Flux Density- How many field lines there are within a region. Size of Current and Length of ... (9) 7. The ... of a current-carrying wire acts against the change made- it tries to get back to normal (8, 5) Down 2. To find the direction of a force, you need to use ... rule (FBI) (8, 4, 4) 3. To create a PD: Move a ... in coil of wire. Move a conductor in magnetic field which turns ... Moving ... in opposite direction results in PD or current being reversed. If ... or coil moves backwards and forwards, alternating current produced (6) 8. The ... is the induction of a potential difference (and current) in a wire which is moving relative to a magnetic field, or experiencing a change in magnetic field. It creates a potential difference in a circuit (9, 6)
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