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# 3 magnetic field and force

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### 3 magnetic field and force

1. 1. MAGNETIC FIELD AND FORCES
2. 2. Hans Christian Ørsted  a compass needle deflected from magnetic north when an electric current from a battery was switched on and off, confirming a direct relationship between electricity and magnetism  magnetic effects radiate from all sides of a wire carrying an electric current, as do light and heat  an electric current produces a circular magnetic field as it flows through a wire
3. 3. PHET Simulation
4. 4. How do we determine the directions of force, field and motion of a charge?
5. 5. Right Hand Rule
6. 6. Right Hand Rule given a Positive charge Thumb- direction of the Force (F) of the charge Palm- direction of Magnetic Field (B) Velocity Four Fingersdirection of the velocity (V)
7. 7. Right Hand Rule given a Negative charge Thumb- direction of the Force (F) of the charge Palm- direction of Magnetic Field (B) Four Fingersdirection of the current (I)
8. 8. Example + V What will be the direction of magnetic field and force of the charge?
9. 9. Video: Magnetic field Line of Forces.
10. 10. Magnetic Lines of Force 1. Lines of force cannot cross each other.
11. 11. Magnetic Lines of Force 2. The concentration of the lines of force at any place shows the strength of the magnetic field at that place. At greater distance, the lines become less concentrated
12. 12. Magnetic Lines of Force 3. Each magnetic line of force is a close curve. Outside the magnet, it goes from north to south. The curve is completed inside the magnet from south to north.
13. 13. Exercises ½ crosswise Page 280 Practice Exercise B,C, D and E Page 281 Practice Exercises 1 and 2