Question 1: Define a solenoid and describe its basic structure.

Answer: A solenoid is a long coil of wire wrapped in many turns that produces a magnetic field when an electric current passes through it.

Question 2: Explain how a solenoid produces a magnetic field.

Answer: A solenoid produces a magnetic field because the electric current flowing through its wire creates a magnetic field similar to that of a bar magnet, with magnetic lines forming loops around the wire.

Question 1: What effect does increasing the number of turns in a solenoid have on its magnetic field?

Answer: Increasing the number of turns strengthens the magnetic field produced by the solenoid.

Question 2: Describe how the direction of the magnetic field in a solenoid can be determined.

Answer: The direction of the magnetic field can be determined using the right-hand rule, where the fingers curl in the direction of current and the thumb points to the magnetic north pole of the solenoid.

Question 1: Calculate the magnetic field strength inside a solenoid with 300 turns, a length of 0.5 meters, and a current of 2 amperes. Use the formula: B = μ₀ * (N/L) * I, where μ₀ = 4π × 10⁻⁷ T·m/A.

Answer: B = 4π × 10⁻⁷ T·m/A * (300 / 0.5 m) * 2 A = approximately 1.51 × 10⁻³ Tesla

Question 1: Describe a simple experiment to demonstrate the magnetic field of a solenoid.

Answer: Connect a solenoid to a battery, and place a small compass near the solenoid. Observe the deflection of the compass needle when current flows, indicating the magnetic field. Turn off the current and observe the needle returning to its original position.

Question 2: Identify two real-world devices that utilize solenoids and explain their functions.

Answer: Electromagnetic relays, which use solenoids to open or close electrical contacts, and electric door locks that use solenoids to lock or unlock doors.

Question 3: Explain why solenoids are important in electromechanical devices and provide an example.

Answer: Solenoids are important because they convert electrical energy into mechanical motion, allowing control of physical devices remotely. For example, in a car starter, the solenoid engages the starter motor when the ignition key is turned.