Câu hỏi về điện trường và tụ điện

A point charge q moves in an electric field along a closed curve, then the work done by the electric field force

• is proportional to the length of the path.

• is non-zero if the electric field is not uniform.

• depends on the shape of the path.

• is always zero.

Each capacitor has a.........written on it, when the capacitor is connected beyond this value, the capacitor becomes a conductor (the capacitor is punctured)

• Limit capacitance

• Limit charge

• Limit electric field

• Limit voltage

According to Coulomb's law about the interaction between two point charges

• the magnitude of the interaction force is directly proportional to the product of the magnitudes of the two charges.

• the magnitude of the interaction force is directly proportional to the square of the distance between them.

• the interaction force is directly proportional to the dielectric constant.

• the interaction force is inversely proportional to the distance between them.

The form of matter existing around a charge created by that charge and characterizing the transmission of interaction between charges is called

• electric field.

• electric potential.

• static electric potential energy.

• electric charge.

Two points M and N lie on the same field line of a uniform electric field with intensity E, the potential difference between M and N is UMN, the distance MN = d. Which of the following formulas is incorrect?

• UMN = VM - VN.

• UMN = E.d

• AMN = q.UMN

• E = UMN.d

A capacitor with capacitance is charged, the energy of the electric field that this capacitor has is

• .

• .

• .

• .

Which of the following diagrams correctly represents the electric field lines of a positively charged sphere?

• .

• .

• .

• .

The force acting on a charge to make it deviate towards the positive plate (as shown in the figure) is which force?

• Gravitational force.

• Frictional force.

• Electric force.

• Gravitational attraction.

When a charge moves into a uniform electric field perpendicular to the electric field lines, which factor will always remain constant?

• Acceleration of motion.

• Direction of motion.

• Speed of motion.

• Displacement after a unit time.

A capacitor is a system consisting of two conductors

• placed close together and connected by a metal wire.

• placed close together and separated by an insulating layer.

• in contact with each other and surrounded by a dielectric.

• placed parallel and separated by another conductor.