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Self - Induction |
When current in a coil increases or decreases, there is a change in magnetic flux linking the coil. Hence, an e.m.f. is induced in the coil. This is called self - induced e.m.f. (es) and the process is it opposes the cause the has produced it. Now the causes of this induced e.m.f. is the change in magnetic flux through the coil (i.e. change of current in the coil). Hence, the induced e.m.f. will oppose the change of current in the coil. If current in the coil is decreasing the induced e.m.f. will oppose the decrees in current. |
The phenomenon of e.m.f. in a thermocouple when its two junction are at different temperature is known as Seebeck Effect. |
Fig (a) |
Illustration:
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Fig (b) |
It may be noted that the e.m.f. induced in a coil will persist so long as the current in the coil is changing. Thus in the above two cases, the induced voltage eventually reduces to zero because there is no continuous attempt to change the current beyond the instant that the switch is closed or opened. |
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