Chapter 4: Electricity and Magnetism Flashcards
(6 cards)
What is a ferromagnetic substance and how does it react?
Materials like iron that can be magnetized; they attract or repel other magnets depending on poles.
What is the right-hand rule for a solenoid?
Thumb points in current direction; fingers curl around coil, showing magnetic field direction.
When is repulsion observed between bar magnet and current-carrying solenoid?
When magnetic fields have opposite poles facing each other.
What is an electromagnet and 4 factors increasing its strength?
A magnet created by electric current; factors: more coils, higher current, ferromagnetic core, tighter coil winding.
What are resistor colour codes for resistance 4200 Ω ±10%?
Yellow (4), Red (2), Red (2), Silver (±10%).
Which resistor colour bands equal 4200 Ω?
Yellow, Red, Red.
