Introduction
Magnetic fields from currents, force on conductors, motors, electromagnetic induction, generators.
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Electromagnetism
Current produces magnetic field (right-hand thumb rule). Solenoid=bar magnet. Fleming's left hand: motor (Field-Current-Force). Fleming's right hand: generator (Field-Motion-Current). Motor: electrical->mechanical (commutator). Generator: mechanical->electrical (slip rings for AC).
Key Points
- •Right-hand thumb rule: current->field direction
- •Left hand=Motor; Right hand=Generator
- •Motor: commutator reverses current
- •AC generator: slip rings; DC: commutator
- •F=BIL
Quick Summary
- ✓Current produces magnetic field
- ✓Left=Motor; Right=Generator
- ✓Motor: electrical->mechanical; Generator: mechanical->electrical
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Key Formulas
F=BIL
AC frequency India: 50Hz
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