A Parallel-Plate Capacitor, with Air Dielectric, Is Charged by a Battery

question 15

Multiple Choice

A parallel-plate capacitor, with air dielectric, is charged by a battery, after which the battery is disconnected.A slab of glass dielectric is then slowly inserted between the plates.As it is being inserted:

• A)a force repels the glass out of the capacitor
• B)a force attracts the glass into the capacitor
• C)no force acts on the glass
• D)a net charge appears on the glass
• E)the glass makes the plates repel each other

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Definitions:

Effective

Producing a desired effect, outcome, or ability to successfully bring about a result, particularly in terms of efficiency or potency.

Average

A statistical measure representing the central or typical value in a set of data, calculated typically as the sum of the values divided by the number of values.

Volt-amperes

A unit of electrical power in an AC circuit equivalent to one volt multiplied by one ampere, used to measure apparent power.

VARs

An abbreviation for Volt-Ampere Reactive, a unit of reactive power in an electrical system, representing the non-working power in an AC circuit.