Atomic Physics
Mon, 05/27/2019 - 17:06 - Adarsh
Exam Prep Study Notes (Things to remember)
22.1 Magnets
- Magnetism is a subject that includes the properties of magnets, the effect of the magnetic force on moving charges and currents, and the creation of magnetic fields by currents.
- There are two types of magnetic poles, called the north magnetic pole and south magnetic pole.
- North magnetic poles are those that are attracted toward the Earth’s geographic north pole.
- Like poles repel and unlike poles attract.
- Magnetic poles always occur in pairs of north and south—it is not possible to isolate north and south poles.
22.2 Ferromagnets and Electromagnets
- Magnetic poles always occur in pairs of north and south—it is not possible to isolate north and south poles.
- All magnetism .........
- ............. as the Hall emf, across a current-carrying conductor by a magnetic field.
- The Hall emf is given by
ε=Blv(B,v,andl,mutually perpendicular)
for a conductor of width l through which charges move at a speed v.
22.7 Magnetic Force on a Current-Carrying Conductor
- The magnetic force on current-carrying conductors is given by
F=IlBsinθ,
where I is the current, l is the length of a straight conductor in a uniform magnetic field B, and θ is the angle between I and B. The force follows RHR-1 with the thumb in the direction of I.
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