Question 1: An electric field is a region around a charged object where other charged objects experience a force. It is represented by field lines that indicate the direction and strength of the field. The strength of an electric field depends on the amount of charge and the distance from the charge.

Answer: An electric field is a region around a charged object where other charged objects experience a force, represented by field lines indicating direction and strength. Its strength depends on charge magnitude and distance.

Question 2: Define electric field strength and state its SI unit.

Answer: Electric field strength is the force per unit positive charge experienced by a test charge placed in the field. Its SI unit is Newton per Coulomb (N/C).

Question 1: Describe how electric field lines indicate the direction of the electric field around a positive and a negative charge.

Answer: Electric field lines radiate outward from positive charges and inward toward negative charges, indicating the direction a positive test charge would be pushed.

Question 2: Explain why electric field strength decreases as the distance from the charge increases.

Answer: Electric field strength decreases with distance because the force exerted by the charge diminishes as the inverse square of the distance from the charge.

Question 3: Multiple Choice: Which of the following correctly describes the relationship between electric field strength (E), charge (Q), and distance (r)?

Answer: E ∝ Q / r²

Question 1: A point charge of 5 μC is located 0.3 meters away from a point where you are measuring the electric field. Calculate the electric field strength at that point. Use the formula: E = k * |Q| / r², where k = 9 × 10^9 N·m²/C².

Answer: E = 9×10^9 * 5×10^-6 / (0.3)^2 = 9×10^9 * 5×10^-6 / 0.09 = 500,000 N/C

Question 2: If the electric field strength at a point is 2,000 N/C and the charge creating the field is 4 μC, calculate the distance from the charge to that point.

Answer: r = √(k * |Q| / E) = √(9×10^9 * 4×10^-6 / 2000) ≈ 0.3 meters

Question 1: Describe a simple experiment to demonstrate the presence of an electric field around a charged object using a pith ball or small conducting sphere. Include the variables involved and safety precautions.

Answer: An experiment involves charging a pith ball or small conducting sphere and suspending it near a charged object. Observe the deflection of the sphere due to the electric field. Variables include charge type, distance, and environmental factors. Precautions include avoiding contact with high-voltage sources and handling charges safely.

Question 2: Explain how electric fields are utilized in industry or technology, providing a specific example.

Answer: Electric fields are used in photocopiers and laser printers to manipulate toner particles via electrostatic forces, enabling precise printing and copying.