Question 1: What is an electric field?

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

Question 2: Describe the mechanism by which an electric field exerts force on a charge.

Answer: An electric field exerts a force on a charge by creating a region where the charge experiences an attraction or repulsion depending on its type and the source charge.

Question 3: State the unit used to measure electric field strength.

Answer: Newtons per Coulomb (N/C).

Question 1: A force of 0.3 Newtons acts on a charge of 0.02 Coulombs. Calculate the electric field strength at that point using the formula E = F / q.

Answer: E = 15 N/C

Question 2: A charge of 5 μC (microcoulombs) is placed in an electric field with a strength of 200 N/C. What force is exerted on the charge? (Use F = E × q, and note that 1 μC = 1×10^-6 C).

Answer: F = 0.001 N

Question 1: Describe an experiment to demonstrate the presence of an electric field around a charged object. Include variables to control and safety precautions.

Answer: To demonstrate an electric field, you can use a pith ball charged by induction or contact with a charged rod. Variables include the charge magnitude and distance. Safety precautions involve avoiding contact with high-voltage sources and handling charges carefully to prevent shocks.

Question 1: In a laboratory, a small metal sphere is charged to a known quantity of 2 μC and placed in a uniform electric field of 100 N/C. Describe the direction and magnitude of the force experienced by the sphere.

Answer: The force is 0.0002 Newtons, directed in the direction of the electric field if the charge is positive, or opposite if negative.

Question 1: A proton (charge = 1.6 × 10^-19 C) is placed in a uniform electric field of 500 N/C. What is the force acting on the proton? Show your calculation.

Answer: F = 8.0 × 10^-17 N

Question 2: Explain how electric fields are utilized in the technology of electrostatic precipitators used in industry.

Answer: Electrostatic precipitators use electric fields to charge particles in industrial emissions. The charged particles are then attracted to oppositely charged plates, removing them from the air and reducing pollution.

Question 1: Describe how electric fields are used in inkjet printers.

Answer: Electric fields are used to control and direct tiny droplets of ink onto paper by charging the droplets and using electric fields to steer their path accurately.