Physics 201 Introduction to Electricity & Magnetism 

December 2 Induced Magnetic Fields and Maxwell's Equations  



Induced electric
fields/ emfs/ currents
A 120 turn coil, of radius 1.8cm and resistance 5.3W is placed outside a long solenoid with 220 turns/ cm and diameter 3.2cm. The initial current in the solenoid is 1.5A and this is reduced to zero and then raised 1.5A in the opposite direction (alternating current) over a period of 50ms. Let's say that the solenoid's current is given by the following equation:
This essentially is a transformer. By pairing
together two coils with different number of turns it is possible to step
up or down the current & voltage.


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