LÍ HK1

Which of the following statements is incorrect?

• Electron is a particle with a negative charge: -1.6 x 10^-19 (C).

• Electron is a particle with a mass of 9.1 x 10^-31 (kg).

• An atom can lose or gain electrons to become an ion.

• Electrons cannot move from one object to another.

Two objects can exert electric force on each other:

• Only when they are both conductors.

• Only when they are both insulators.

• When one is an insulator and the other is a conductor.

• When one of the two objects carries an electric charge.

Which of the following statements is incorrect?

• In a conductor, there are many free charges.

• In an insulator, there are very few free charges.

• Overall, a charged object still behaves like a neutral object.

• Overall, a charged object in contact still behaves like a neutral object.

The intensity of the electric field at a point characterizes the electric field at that point in terms of:

• The direction of the electric field vector.

• The direction of the force acting.

• The magnitude of the electric field vector.

• The effect of electric force.

Which of the following concepts describes the strength of the electric field at a point?

• Electric charge

• Electric field

• Electric field strength

• Electric field lines

The direction of the electric field vector caused by a point charge Q < 0 at a point M is:

• Towards Q.

• Away from Q.

• In the same direction as F.

• Opposite to the direction of F.

The work done by the electric force on a charge:

• Does not depend on the path taken by the charge.

• Depends only on the magnitude of the charge.

• Depends on the path taken by the charge.

• Depends only on the strength of the electric field.

The relationship between the electric potential U_MN and the electric potential U_NM is:

• U_MN = - U_NM.

• U_MN = U_NM.

• U_MN = 1/U_NM.

What is the relationship between the electric potential U MN and U NM?

• U MN = - U NM

• U MN = U NM

• U MN = 1/U NM

• U MN = -1/U NM

The electric potential between two points M and N is. Choose the correct statement.

• The potential at M is higher than at N

• The potential at N is zero.

• The potential at M is positive, at N is negative.

• The potential at M is.