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Question
Which of the following cannot be used as a dielectric in a capacitor ?
Which of the following cannot be used as a dielectric in a capacitor ?
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Solution
The correct option is D Copper
A dielectric is basically an insulator or a very poor conductor. Of the given options, copper is a metal, hence a conductor of electricity. It cannot be used to make a dielectric. Paper, glass and oil are insulators and can be used to make a dielectric.
The dielectric material is an insulator, so it's surface molecules become polarized by the electric field between the capacitor plates. This polarization acts to reduce the strength of the electric field between the plates for a given capacitor charge, which allows somewhat more charge to be deposited into the capacitor for a given voltage across the capacitor terminals.
Key concept- Metal as a dielectric medium.
A dielectric is basically an insulator or a very poor conductor. Of the given options, copper is a metal, hence a conductor of electricity. It cannot be used to make a dielectric. Paper, glass and oil are insulators and can be used to make a dielectric.
The dielectric material is an insulator, so it's surface molecules become polarized by the electric field between the capacitor plates. This polarization acts to reduce the strength of the electric field between the plates for a given capacitor charge, which allows somewhat more charge to be deposited into the capacitor for a given voltage across the capacitor terminals.
| Key concept- Metal as a dielectric medium. |
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