Question

The electrical resistance of insulators is

• A. high
• B. low
• C. zero
• D. infinitely high

Answer 1

The correct option is D

infinitely high

The explanation for Correct answer:

Option (D) Infinitely high

1. Resistance is the property of a material to oppose the flow of charges in the circuit and hence no flow of current will takes place.
2. The magnitude of resistance of a wire is given by Ohm’s law as $\mathrm{R}=\frac{\mathrm{V}}{\mathrm{I}}$ and its SI unit is denoted by Ohm($\Omega$).
3. Conductors are ones that pass current through them very easily and thus have very low resistance as the gap between the conduction band and valence band in conductors is very low.
4. Ionic compounds are examples of conductors that pass electricity through them easily.
5. However, in insulators, the gap between the conduction band and valence band is much greater than in conductors which won’t allow them to conduct electricity very easily and thus shows greater resistance.
6. Plastic, paper, and glass are some common examples of insulators that won’t pass electricity through them easily.

Therefore, the electrical resistance of insulators is infinitely high.