Question

State ohms law? Is it valid for insulators ?

Answer 1

Answer:

ohms law:-

at constant temperature the current flowing in the conductor is directly proportional to the potential difference across its ends

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it is valid only for conductors not for insulators

Answer 2

Answer:

(i)According to Ohm's law, this constant is the Resistance of the conductor. But research shows that the Resistance is directly proportional to length of the conductor and inversely proportional to the area of cross-section of the conductor.

(ii) Its valid only if temperature and other conditions remain unchanged. If temperature varies then resistance is no longer constant and hence ohms law is invalid.