# Electrostatics & Magnetism Flashcards

Electrostatics & Magnetism Flashcards
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Ferromagnetic Materials

A group of materials that can that can be turned into magnets when exposed to a magnetic field

Causes magnetic domains within the material to align with the field

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A cage made of conductive material that insulates whatever is inside from electric fields and electromagnetic radiation by generating an equal and opposite force, cancelling the external force

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Voltage

A numerical value expressing the potential work that, if put into a circuit, a group of charged particles could do

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An electric field of 2 N/C is generated by a positive charge. Find the force and direction exerted on a -4 C charge.

2 N/C * -4 C = -8 N

A negative force indicates 'in the opposite direction of the electric field'. So, if the field was pointing to the right, the negative charge will be pulled left.

Got it
Find the electric field strength for a 5 coulomb charge that is 2 meters away.

E = kq / d2 = 9 * 109 N m2/C2 * 5 C / (2 m)2 = 1.13 * 1010 N/C

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Determine the change in the force between two charges when one of the charges and the distance between them is halved.

Coulomb's Law: F = k * q1 * q2 / d2

Dividing a charge in half divides the force in half

Dividing a charge in half multiplies a force by 4

Together: doubles the force (2x)

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Electric Force Field

The space around a charged particle in which other particles can experience a force

Dependent on the type of charge (opposites attract) and the distance between the particles (closer = stronger)

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Ion

A charged atom caused by loss of electrons (positive ion/cation) or gain of electrons (negative ion/anion)

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Static Electricity

An unbalanced electric charge caused when protons and electrons are separated

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Electric Charge

Electrical energy found in protons (positive charge) and electrons (negative charge)

Conserved: cannot be created or destroyed

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## Flashcard Content Overview

Electrostatics and magnetism are two topics in physics that are often taught together because of their similarities and relationship to one another. These flashcards will give an overview of the definitions and equations commonly seen when working with electric and magnetic fields.

Front
Back
Electric Charge

Electrical energy found in protons (positive charge) and electrons (negative charge)

Conserved: cannot be created or destroyed

Static Electricity

An unbalanced electric charge caused when protons and electrons are separated

Ion

A charged atom caused by loss of electrons (positive ion/cation) or gain of electrons (negative ion/anion)

Electric Force Field

The space around a charged particle in which other particles can experience a force

Dependent on the type of charge (opposites attract) and the distance between the particles (closer = stronger)

Determine the change in the force between two charges when one of the charges and the distance between them is halved.

Coulomb's Law: F = k * q1 * q2 / d2

Dividing a charge in half divides the force in half

Dividing a charge in half multiplies a force by 4

Together: doubles the force (2x)

Find the electric field strength for a 5 coulomb charge that is 2 meters away.

E = kq / d2 = 9 * 109 N m2/C2 * 5 C / (2 m)2 = 1.13 * 1010 N/C

An electric field of 2 N/C is generated by a positive charge. Find the force and direction exerted on a -4 C charge.

2 N/C * -4 C = -8 N

A negative force indicates 'in the opposite direction of the electric field'. So, if the field was pointing to the right, the negative charge will be pulled left.

Voltage

A numerical value expressing the potential work that, if put into a circuit, a group of charged particles could do

A cage made of conductive material that insulates whatever is inside from electric fields and electromagnetic radiation by generating an equal and opposite force, cancelling the external force

Ferromagnetic Materials

A group of materials that can that can be turned into magnets when exposed to a magnetic field

Causes magnetic domains within the material to align with the field

Magnetic Field

The space around a magnet in which other magnets can feel a force

Created by charged particles that are moving

Electromagnet

A magnet whose magnetic field is made through the use of an electric coil wrapped around a (usually ferromagnetic) material

Found in speakers, motors, hard drives of computers, and other devices

Direction of Magnetic Force on a Charge

Dependent on if charge is positive or negative, the direction of the magnetic field, and the direction of the charge

Force will be perpendicular to both the magnetic field and the charge direction

Determine the force felt by a negative charge moving right to left through a rightward pointing magnetic field.

If the charge is moving parallel to a magnetic field, it will not feel any force.

Determine the direction of a force felt by a positive charge moving right to left through a magnetic field pointing towards you.

The force will try to push the charge upwards.

Right-Hand Rule

A method that uses the orientation of fingers on your right hand to determine the direction of a magnetic field, a current, or a magnetic force

Determine the magnitude of the Lorentz force felt by a 0.5 C charge moving 3 m/s in an electrical field of 6 N/C and a magnetic field of 0.020 T at a 60 degree angle.

F = qE + qvBsinθ = 0.5 C * 6 N/C + 0.5 C * 3 m/s * 0.020 T * sin(60°) = 3.026 N

Determine the strength of the magnetic field that is 100 mm away from a wire containing 10 amps of current.

B = μ * I / 2πr = 1.26 * 10-6 Tm/A * 10 A / (2 * π * 0.100 m) = 2.01 * 10-5 T

Mutual Inductance and Wireless Charging

Allows for charging of devices without direct physical contact (charger has primary coil while device has secondary coil)

Prevents electric shocks in water-containing environments

Relationship between number of turns in primary and secondary coils

Number of turns in secondary coil directly proportional to increase in voltage (2x turns = 2x voltage)

Current and voltage are inversely proportional (2x voltage = x/2 current)

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