Which property measures a material's ability to store electrical energy in an electric field?

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Multiple Choice

Which property measures a material's ability to store electrical energy in an electric field?

A material’s ability to store electrical energy in an electric field is described by its dielectric constant (relative permittivity). This property measures how readily a material polarizes in response to an electric field, which directly affects how much energy can be stored in a given volume. In capacitors, a higher dielectric constant increases capacitance (C = εA/d) and, more generally, the energy stored per volume follows u = 1/2 ε E^2, where ε = ε0εr. So the dielectric constant captures the material’s capacity to hold electric energy when an electric field is present. The other terms refer to different concepts: EMI is about unwanted electromagnetic interference; EMC concerns a device’s ability to operate correctly in the presence of electromagnetic disturbance and without causing it; multimode fiber relates to transmitting light in fiber optics, not energy storage in an electric field.

A material’s ability to store electrical energy in an electric field is described by its dielectric constant (relative permittivity). This property measures how readily a material polarizes in response to an electric field, which directly affects how much energy can be stored in a given volume. In capacitors, a higher dielectric constant increases capacitance (C = εA/d) and, more generally, the energy stored per volume follows u = 1/2 ε E^2, where ε = ε0εr. So the dielectric constant captures the material’s capacity to hold electric energy when an electric field is present.

The other terms refer to different concepts: EMI is about unwanted electromagnetic interference; EMC concerns a device’s ability to operate correctly in the presence of electromagnetic disturbance and without causing it; multimode fiber relates to transmitting light in fiber optics, not energy storage in an electric field.

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