Electromagnetism Quiz: Electric Fields and Induction

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Questions and Answers

What describes the electric field in a vacuum?

Electric intensity

What is the relationship between electric induction and electric intensity?

Electric induction = permitivity x electric intensity

What is the total electric charge of n capacitors in series, each with a capacity of C?

The same as each individual capacitor

What is the voltage difference at the terminals of n capacitors in series?

The sum of the voltage differences of each capacitor Signup and view all the answers

In which order do the following materials have increasing electrical conductivity?

Aluminum, copper, silver Signup and view all the answers

What is the unit of measurement for magnetic induction?

Tesla Signup and view all the answers

What is the equivalent capacitance of two capacitors, each with a capacitance of C, connected in series?

C/2 Signup and view all the answers

What is the self-inductance of a coil carrying a current of intensity i?

The ratio of the coil's own flux to the current Signup and view all the answers

Why don't we get electrocuted when we touch a conductor?

Because the electric charge that passes through us is not very large Signup and view all the answers

What type of force exists between two parallel conductors in a vacuum?

Electrodynamical force Signup and view all the answers

What happens when a bar is moved in a constant magnetic field?

An electromotive force is induced Signup and view all the answers

What happens when a conductor is electrified by electrostatic influence?

The conductor is charged with electric charge Signup and view all the answers

What happens when two-current carrying conductors are perpendicular to each other in a plane?

An electrodynamical force exists between them Signup and view all the answers

What does it mean when a dielectric is electrically polarized?

The electric dipoles orient themselves Signup and view all the answers

What is the magnetic field in a vacuum described by?

The circulation of the magnetic field intensity on a closed contour Signup and view all the answers

Which of the following relations is true?

Magnetic induction = permeability x magnetic field intensity Signup and view all the answers

What is the equivalent resistance of n resistors connected in parallel?

Sum of the inverses of the resistances of the n resistors Signup and view all the answers

What does it mean when a dielectric is electrically polarized?

The electric dipoles are oriented Signup and view all the answers

Which of the following relations is true?

Electric induction = permitivity x intensity of electric field Signup and view all the answers

What is the unit of measurement for?

Inductance Signup and view all the answers

What do I1 and I2 represent?

The intensities of the currents flowing through two conductors Signup and view all the answers

What does the self-inductance of a coil depend on?

Permeability Signup and view all the answers

What is the direction of the force acting on a conductor?

Perpendicular to the table top with the sense out of the table Signup and view all the answers

What can deflect a beam of electrons?

A combination of electric and magnetic fields Signup and view all the answers

What happens to the local charge on the earth when a cloud with positive electric charges approaches?

It becomes negatively charged Signup and view all the answers

How does the electrodynamic force between two parallel conductors depend on the distance r between them?

Inversely proportional to the square of r Signup and view all the answers

How does the capacitance of a capacitor depend on the relative permittivity?

It depends directly on the relative permittivity Signup and view all the answers

How is electric charge distributed in a massive conductor?

Only on the surface Signup and view all the answers

What is the direction of the force on a charge in a magnetic field?

Perpendicular to the magnetic field lines Signup and view all the answers

What is the condition for electrostatic induction to occur?

The cloud must be close to the earth Signup and view all the answers

Why is the phenomenon of electrocution in an electrostatic field rare?

The voltages are low and the charge involved is small. Signup and view all the answers

When you touch the dome of a Van de Graff generator and stand on a plastic chair, why does your hair stand up?

The hairs on your head become charged with the same sign. Signup and view all the answers

If a positively charged body is connected to the ground, what happens to the surplus charge?

The surplus positive charge flows to the ground. Signup and view all the answers

What is the distribution of electric charge inside a charged conductor?

The charge is zero. Signup and view all the answers

What does Ohm's Law relate?

Voltage and current. Signup and view all the answers

What is the equivalent of capacitance in electrostatics for inductance in electromagnetism?

Inductance. Signup and view all the answers

In order of increasing frequency, which sequence is correct?

Radio waves, visible spectrum, infrared waves, ultraviolet waves. Signup and view all the answers

What is the primary equation of material in an electrostatic field?

Permittivity. Signup and view all the answers

Study Notes

Electric Field and Magnetism

The electric field in a vacuum is described by the electric field intensity and the electric induction.
The electric field intensity is a vector field that is proportional to the force experienced by a test charge at a given point in space.
The electric induction, also known as the electric flux density, is a measure of the electric field intensity at a given point in space.

Capacitance and Electric Charge

The capacitance of a capacitor is the ratio of the electric charge stored on the capacitor to the voltage across it.
The capacitance of a capacitor depends on the permitivity of the material, the distance between the plates, and the area of the plates.
When a capacitor is connected in series, the equivalent capacitance is less than the capacitance of each individual capacitor.

Magnetic Field and Inductance

The magnetic field is a vector field that describes the magnetic force experienced by a moving charge or a current-carrying wire.
The magnetic flux is a measure of the magnetic field that passes through a given area.
The inductance of a coil is the ratio of the magnetic flux through the coil to the current flowing through it.

Electromagnetic Induction and Faraday's Law

Electromagnetic induction is the process by which a changing magnetic flux induces an electromotive force (EMF) in a conductor.
Faraday's law of induction states that the EMF induced in a conductor is proportional to the rate of change of the magnetic flux through the conductor.

Electric Current and Resistance

Electric current is the flow of electric charge, typically measured in amperes (A).
Resistance is the opposition to the flow of electric current, measured in ohms (Ω).
Ohm's law states that the voltage (V) across a conductor is proportional to the current (I) flowing through it, with the proportionality constant being the resistance (R).

Electromagnetic Waves and Frequency

Electromagnetic waves are waves of electric and magnetic fields that propagate through space.
The frequency of an electromagnetic wave is the number of oscillations per second, measured in hertz (Hz).
The order of increasing frequency is: radio waves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.

Miscellaneous

When a dielectric material is polarized, the electric dipoles align, resulting in a net electric field.
The force between two parallel conductors carrying current is inversely proportional to the distance between them.
A conductor in a magnetic field will experience a force, the direction of which depends on the direction of the magnetic field and the sense of the current flow.
When a conductor is charged and earthed, the surplus charge flows to earth, neutralizing the conductor.
The Hall effect is the production of a voltage across a conductor perpendicular to the direction of the current flow and the magnetic field.

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Electromagnetism Quiz: Electric Fields and Induction

Questions and Answers

What describes the electric field in a vacuum?

What is the relationship between electric induction and electric intensity?

What is the total electric charge of n capacitors in series, each with a capacity of C?

What is the voltage difference at the terminals of n capacitors in series?

In which order do the following materials have increasing electrical conductivity?

What is the unit of measurement for magnetic induction?

What is the equivalent capacitance of two capacitors, each with a capacitance of C, connected in series?

What is the self-inductance of a coil carrying a current of intensity i?

Why don't we get electrocuted when we touch a conductor?

What type of force exists between two parallel conductors in a vacuum?

What happens when a bar is moved in a constant magnetic field?

What happens when a conductor is electrified by electrostatic influence?

What happens when two-current carrying conductors are perpendicular to each other in a plane?

What does it mean when a dielectric is electrically polarized?

What is the magnetic field in a vacuum described by?

Which of the following relations is true?

What is the equivalent resistance of n resistors connected in parallel?

What does it mean when a dielectric is electrically polarized?

Which of the following relations is true?

What is the unit of measurement for?

What do I1 and I2 represent?

What does the self-inductance of a coil depend on?

What is the direction of the force acting on a conductor?

What can deflect a beam of electrons?

What happens to the local charge on the earth when a cloud with positive electric charges approaches?

How does the electrodynamic force between two parallel conductors depend on the distance r between them?

How does the capacitance of a capacitor depend on the relative permittivity?

How is electric charge distributed in a massive conductor?

What is the direction of the force on a charge in a magnetic field?

What is the condition for electrostatic induction to occur?

Why is the phenomenon of electrocution in an electrostatic field rare?

When you touch the dome of a Van de Graff generator and stand on a plastic chair, why does your hair stand up?

If a positively charged body is connected to the ground, what happens to the surplus charge?

What is the distribution of electric charge inside a charged conductor?

What does Ohm's Law relate?

What is the equivalent of capacitance in electrostatics for inductance in electromagnetism?

In order of increasing frequency, which sequence is correct?

What is the primary equation of material in an electrostatic field?

Study Notes

Electric Field and Magnetism

Capacitance and Electric Charge

Magnetic Field and Inductance

Electromagnetic Induction and Faraday's Law

Electric Current and Resistance

Electromagnetic Waves and Frequency

Miscellaneous

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