Uniform Electric Fields Revision

Uniform Electric Fields Revision

Electric Fields

• A region of space where a charged object will feel a force.

• Field lines go from positive to negative.

• Field strength indicated by how close the field lines are together.

Multiple Choice

The diagram shows two parallel metal plates X and Y. Plate X is at Earth potential (0 V) and the potential of plate Y is V0.

Which of the following is correct in respect of the magnitude and the direction of the electric field between the plates?

• Magnitude: Constant

  Direction: X → Y

• Magnitude: Increasing

  Direction: Y → X

• Magnitude: Constant

  Direction: Y → X

• Magnitude: Increasing

  Direction: X → Y

Multiple Choice

The diagram below shows a particle with positive charge q accelerating between two conducting plates at potentials V₁ and V₂.

Which of the following is the kinetic energy gained by the charge in moving between the plates?

• V₂q

• V₁q

• (V₁ – V₂)q

• (V₂ – V₁)q

Multiple Choice

The diagram below shows a uniform electric field of strength E. The field is in a vacuum.

An electron enters the field with a velocity v in the direction shown. The electron is moving in the plane of the paper. The path followed by the electron will be:

• parabolic.

• in the direction of E.

• in the direction of v.

• circular.

Multiple Choice

The electric field strength at a point may be defined as:

• the force exerted on unit positive charge placed at that point.

• the force per unit positive charge on a small test charge placed at that point.

• the work done on unit positive charge to move the charge to that point from infinity.

• the work done per unit positive charge to move a small test charge to that point from infinity.

Multiple Choice

A positively charged particle follows a circular path as shown in the diagram.

Which of the following electric fields could have caused the charged particle to follow the above path?

Multiple Choice

Which of the following gives the acceleration of an electron of electric charge e and mass m in a uniform electric field of strength E?

• E

• Ee

• $\frac{Ee}{m}$

• $\frac{m}{Ee}$