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Yogita Ingle 6 years, 3 months ago
Limitations of this law:
- Now, this law is valid for conductors only and that too at a constant temperature. The resistance of a conductor increases with temperature. Hence, for changing temperature the V-I graph for a conductor will be non-linear (not a straight line).
- In case of insulators ohm’s law is not followed at all, insulators do not conduct at all. But, when a very high voltage is applied across an insulator dielectric break down occurs and all of a sudden current begins to flow.
- Ohm’s law is not followed by semiconductors. The V-I graph has a steep rising at a particular voltage, which indicates that the material begins to conduct properly only after a certain voltage.
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Yogita Ingle 6 years, 3 months ago
The direction of the current induced in the conductor due to this induced EMF is such that it opposes the change that produced it in the first place.In other words, the induced EMF has a polarity which opposes the change in the magnetic flux through the conducting loop. Hence, induced EMF is also called Back EMF.

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