IGCSE Physics Magnetism & Electromagnetism (Edexcel) All Answers Correct

IGCSE Physics Magnetism & Electromagnetism (Edexcel) All Answers Correct 1. Define magnetic field. - Magnetic field is the area where magnetic materials experience a force. 2. What do magnetic field lines indicate? - Magnetic field lines show the magnitude and direction of magnetic fields, always running from north to south. 3. Define uniform magnetic field. - A uniform magnetic field exists when the field lines are evenly spaced and parallel, such as between the north and south poles of two adjacent bar magnets. 4. What is electromagnetism? - Electromagnetism refers to the production of a magnetic field around a conductor carrying an electric current. 5. Explain magnetically soft materials. - Magnetically soft materials are easily magnetized and demagnetized. 6. Explain magnetically hard materials. - Magnetically hard materials are difficult to magnetize and demagnetize. 7. How can you increase the strength of an electromagnet? - You can make an electromagnet stronger by adding more turns to the coil, increasing the current flowing through the coil, or wrapping the coil around a soft iron core. 8. What does the right hand rule demonstrate? - The right hand rule shows the direction of force on a current-carrying conductor placed in a magnetic field. 9. Define the motor effect. - The motor effect occurs when a current-carrying conductor placed in a magnetic field experiences a force, causing it to move. 10. Why does the motor effect occur? - Electrons in a current flowing through a magnetic field experience a force perpendicular to both the current direction and the magnetic field lines, resulting in movement unless the current is parallel to the field lines. What does Fleming's left hand rule show? ️-Thumb=direction of force. -Index finger=magnetic field. -Middle finger=current. Describe the electric motor. ️-A coil of wire that is free to rotate is placed between two opposite poles. -When a current flows through the coil it experiences a force and moves. -Because the coil is on a spindle and forces act one up and one down, it rotates. What is the function of the split-ring commutator in an electric motor? ️-Swaps the contacts every half-turn to keep the motor rotating in the same direction. How can the speed of the electric motor be increased? ️-Adding more turns to the coil. -Increasing the current. -Stronger magnetic field. -A soft iron core. How does a loudspeaker function? ️-A.C signals from an amplifier are fed to a coil of wire in the speaker, which is wrapped around the base of a cone. -The coil is surrounded by a permanent magnet, so the A.C signals cause a force on the coil and make it move back and forth. -These movements make the cone vibrate and create a sound wave What is electromagnetic induction? ️-The creation of a voltage in a wire which is experiencing a