NEET Physics Ohm's Law MCQ Question
Which of the following statements about Ohm's Law is correct?
Ohm's law states that the current density is directly proportional to the electric field.
Ohm's law is valid for all materials regardless of their properties.
Ohm's law applies only to insulating materials, not to conductors.
The relationship between voltage and current is always linear for all devices.
Correct Answer
Detailed Explanation
Ohm's law, as mentioned in the NCERT context, indicates that the current density (j) is directly proportional to the electric field (E), which is expressed as j = sE, where s is the conductivity. This relationship does not hold for all materials, particularly in non-ohmic devices like diodes.
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