📚 Topic Summary
Magnetic fields are invisible forces created by moving electric charges (current) or magnetic materials. Mapping these fields allows us to visualize their direction and strength around magnets or current-carrying wires. The right-hand rule is a handy tool to determine the direction of the magnetic field generated by a current. By aligning your thumb with the current direction, your curled fingers show the direction of the magnetic field lines.
🧠 Part A: Vocabulary
Match the terms with their definitions:
| Term |
Definition |
| 1. Magnetic Field |
A. A region around a magnet or current-carrying wire where magnetic forces are exerted. |
| 2. Magnetic Field Line |
B. A rule used to determine the direction of the magnetic field around a current-carrying wire. |
| 3. Right-Hand Rule |
C. The phenomenon of a moving electric charge experiencing a force in a magnetic field. |
| 4. Magnetic Force |
D. A line that visually represents the direction of the magnetic field. |
| 5. Current |
E. The rate of flow of electric charge. |
Match the correct letter (A-E) with each number (1-5).
⚡ Part B: Fill in the Blanks
Complete the following paragraph with the correct words.
A ________________ (1) field is created around a _______________ (2) wire. The strength of the field is _______________ (3) proportional to the current and _______________ (4) proportional to the distance from the wire. The _______________ (5) rule helps determine the direction of the magnetic field.
🤔 Part C: Critical Thinking
Imagine you have a long, straight wire carrying current upwards. Using the right-hand rule, describe the shape and direction of the magnetic field around the wire. How would increasing the current affect the magnetic field?