A2 level 9702 Physics Electric Fields and Electic potential Flashcards
What is an electric field?
An electric field is a region around a charged object where other charged objects experience a force.
True or False: Electric fields can exist in a vacuum.
True
What is the unit of electric field strength?
The unit of electric field strength is volts per meter (V/m).
Fill in the blank: The electric field ( E ) due to a point charge ( Q ) at a distance ( r ) is given by the formula ( E = rac{kQ}{r^2} ), where ( k ) is _____ .
Coulomb’s constant
What does the direction of an electric field vector indicate?
The direction of an electric field vector indicates the direction of the force that a positive test charge would experience.
Which of the following is a vector quantity: electric field strength or electric potential?
Electric field strength is a vector quantity.
What is electric potential?
Electric potential is the work done per unit charge in bringing a charge from infinity to a point in an electric field.
True or False: Electric potential is a scalar quantity.
True
What is the unit of electric potential?
The unit of electric potential is the volt (V).
Fill in the blank: The electric potential ( V ) due to a point charge ( Q ) at a distance ( r ) is given by the formula ( V = rac{kQ}{r} ), where ( k ) is _____ .
Coulomb’s constant
What is the relationship between electric field and electric potential?
The electric field is the negative gradient of the electric potential.
Which law describes the force between two point charges?
Coulomb’s Law describes the force between two point charges.
What is Coulomb’s Law formula?
Coulomb’s Law formula is ( F = rac{k |Q_1 Q_2|}{r^2} ).
Fill in the blank: The potential difference between two points is also known as _____ .
Voltage
What occurs when a charged object is brought near a neutral object?
The neutral object may become polarized, causing a redistribution of charge.
True or False: The electric field inside a conductor in electrostatic equilibrium is zero.
True
What is the principle of superposition in electric fields?
The principle of superposition states that the total electric field created by multiple charges is the vector sum of the individual fields.
How does the electric field behave in a uniform field?
In a uniform electric field, the electric field strength is constant in magnitude and direction.
What is the equipotential surface?
An equipotential surface is a surface on which the electric potential is the same at every point.
True or False: Work is done when moving a charge along an equipotential surface.
False
What does a positive test charge experience in an electric field directed from positive to negative?
A positive test charge will experience a force in the direction of the electric field.
Fill in the blank: The work done in moving a charge ( q ) through a potential difference ( V ) is given by the formula _____ .
W = qV
What is the relationship between electric potential energy and electric potential?
Electric potential energy is equal to the product of the charge and the electric potential.
In a parallel plate capacitor, what is the relationship between the electric field and the potential difference?
The electric field ( E ) is equal to the potential difference ( V ) divided by the distance ( d ) between the plates: ( E = rac{V}{d} ).
True or False: Electric field lines can cross each other.
False
What is the shape of the electric field lines around a positive point charge?
The electric field lines radiate outward from a positive point charge.
What does a negative charge do in an electric field?
A negative charge moves in the opposite direction of the electric field lines.
Fill in the blank: The electric field due to an infinite plane sheet of charge is _____ .
Uniform
What is the formula for the electric field due to a uniformly charged spherical shell outside the shell?
The electric field is given by ( E = rac{kQ}{r^2} ), where ( Q ) is the total charge and ( r ) is the distance from the center.
True or False: The electric potential inside a uniformly charged spherical shell is zero.
False
What happens to the electric potential as you move farther away from a point charge?
The electric potential decreases as you move farther away from a point charge.
Fill in the blank: The electric potential at infinity is defined as _____ .
Zero
