# Basic Electrical Engineering Questions and Answers – Displacement Current in a Dielectric

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This set of Basic Electrical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Displacement Current in a Dielectric”.

1. The current in conductors connecting the voltage source to the plates of a capacitor is _______
a) Conduction current
b) Leakage current
c) Charging current
d) Displacement current

Explanation: The current in conductors connecting the voltage source to the plates of a capacitor is the charging current and not the conduction or leakage current.

2. Under normal conditions capacitors have _______
a) Displacement current
b) Conduction current
c) Both conduction and displacement current
d) Neither conduction nor displacement current

Explanation: Under normal conditions capacitors contain an insulating material called dielectric sandwiched between the plates of the capacitor. Since insulators can carry only an electric field but not moving carriers, therefore normally a capacitor has displacement current and not conduction current.

3. What is the unit for displacement current?
a) No unit
b) Ampere
c) Coulomb
d) Ampere/coulomb

Explanation: Displacement current is a type of current and hence it has the same unit as that of current that is ampere.
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4. Displacement current depends on ___________
a) Moving charges
b) Change in time
c) Both moving charges and change in time
d) Neither moving charges nor change in time

Explanation: Displacement current is the current which arises due to variations in the field. Hence, it does not depend on the moving charges but it changes with time which causes variation in the field.

5. Magnetic fields between the parallel plates of a capacitor are due to?
a) Displacement current
b) Conduction current
c) Both conduction and displacement current
d) Neither conduction nor displacement current

Explanation: Displacement current is the current which arises due to variations in the field. Change in the field results in the formation of magnetic fields. Hence displacement currents lead to magnetic field between the plates of a capacitor.

6. The free electrons in practical dielectrics are due to ________
a) There are no free electrons
b) Conductors
c) Impurities
d) Displacement currents

Explanation: Ideally, dielectrics are insulators and do not contain any free electrons. But no dielectric is a perfect dielectric, hence the free electrons are due to impurities present in each dielectric.

7. The flow of electrons which does not pass through the battery is known as ____________
a) Conduction current
b) Leakage current
c) Charging current
d) Displacement current

Explanation: Conduction current is the flow of electrons from the positive plate of the capacitor to the negative plate of the capacitor, not through the battery. Hence the type of current which flows without passing through the battery is conduction current.

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