A2 level 9702 Physics Electric Fields and Electic potential

Question 1

What is an electric field?

Answer 1

An electric field is a region around a charged object where other charged objects experience a force.

Question 2

True or False: Electric fields can exist in a vacuum.

Answer 2

True

Question 3

What is the unit of electric field strength?

Answer 3

The unit of electric field strength is volts per meter (V/m).

Question 4

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 _____ .

Answer 4

Coulomb’s constant

Question 5

What does the direction of an electric field vector indicate?

Answer 5

The direction of an electric field vector indicates the direction of the force that a positive test charge would experience.

Question 6

Which of the following is a vector quantity: electric field strength or electric potential?

Answer 6

Electric field strength is a vector quantity.

Question 7

What is electric potential?

Answer 7

Electric potential is the work done per unit charge in bringing a charge from infinity to a point in an electric field.

Question 8

True or False: Electric potential is a scalar quantity.

Answer 8

True

Question 9

What is the unit of electric potential?

Answer 9

The unit of electric potential is the volt (V).

Question 10

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 _____ .

Answer 10

Coulomb’s constant

Question 11

What is the relationship between electric field and electric potential?

Answer 11

The electric field is the negative gradient of the electric potential.

Question 12

Which law describes the force between two point charges?

Answer 12

Coulomb’s Law describes the force between two point charges.

Question 13

What is Coulomb’s Law formula?

Answer 13

Coulomb’s Law formula is ( F = rac{k |Q_1 Q_2|}{r^2} ).

Question 14

Fill in the blank: The potential difference between two points is also known as _____ .

Answer 14

Voltage

Question 15

What occurs when a charged object is brought near a neutral object?

Answer 15

The neutral object may become polarized, causing a redistribution of charge.

Question 16

True or False: The electric field inside a conductor in electrostatic equilibrium is zero.

Answer 16

True

Question 17

What is the principle of superposition in electric fields?

Answer 17

The principle of superposition states that the total electric field created by multiple charges is the vector sum of the individual fields.

Question 18

How does the electric field behave in a uniform field?

Answer 18

In a uniform electric field, the electric field strength is constant in magnitude and direction.

Question 19

What is the equipotential surface?

Answer 19

An equipotential surface is a surface on which the electric potential is the same at every point.

Question 20

True or False: Work is done when moving a charge along an equipotential surface.

Answer 20

False

Question 21

What does a positive test charge experience in an electric field directed from positive to negative?

Answer 21

A positive test charge will experience a force in the direction of the electric field.

Question 22

Fill in the blank: The work done in moving a charge ( q ) through a potential difference ( V ) is given by the formula _____ .

Answer 22

W = qV

Question 23

What is the relationship between electric potential energy and electric potential?

Answer 23

Electric potential energy is equal to the product of the charge and the electric potential.

Question 24

In a parallel plate capacitor, what is the relationship between the electric field and the potential difference?

Answer 24

The electric field ( E ) is equal to the potential difference ( V ) divided by the distance ( d ) between the plates: ( E = rac{V}{d} ).

Question 25

True or False: Electric field lines can cross each other.

Answer 25

False

Question 26

What is the shape of the electric field lines around a positive point charge?

Answer 26

The electric field lines radiate outward from a positive point charge.

Question 27

What does a negative charge do in an electric field?

Answer 27

A negative charge moves in the opposite direction of the electric field lines.

Question 28

Fill in the blank: The electric field due to an infinite plane sheet of charge is _____ .

Answer 28

Uniform

Question 29

What is the formula for the electric field due to a uniformly charged spherical shell outside the shell?

Answer 29

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.

Question 30

True or False: The electric potential inside a uniformly charged spherical shell is zero.

Answer 30

False

Question 31

What happens to the electric potential as you move farther away from a point charge?

Answer 31

The electric potential decreases as you move farther away from a point charge.

Question 32

Fill in the blank: The electric potential at infinity is defined as _____ .

Answer 32

Zero