Question 1: Define Fleming's Left Hand Rule and explain its purpose in understanding the motor effect.

Answer: Fleming's Left Hand Rule is a mnemonic to determine the direction of force on a current-carrying conductor in a magnetic field. The rule states that the First finger points in the direction of the Magnetic Field, the Second finger in the direction of the Current, and the Thumb indicates the direction of the Force or Motion.

Question 2: What are the three directions indicated by Fleming's Left Hand Rule, and how are they related?

Answer: The three directions are: the magnetic field (First finger), the current (Second finger), and the force or motion (Thumb). The rule helps determine the force's direction based on the magnetic field and current directions.

Question 1: A wire of length 0.5 meters carries a current of 3 amperes in a magnetic field of flux density 0.2 teslas. Calculate the magnitude of the force acting on the wire using Fleming's Left Hand Rule.

Answer: Force (F) = BIL sin θ; Assuming θ = 90°, F = 0.2 T × 0.5 m × 3 A = 0.3 newtons.

Question 2: If the force acting on a conductor is 0.6 N, the magnetic flux density is 0.3 T, and the length of the conductor is 2 m, what current is flowing through the wire?

Answer: I = F / (B × L) = 0.6 N / (0.3 T × 2 m) = 1 ampere.

Question 1: Describe a simple experiment to demonstrate Fleming's Left Hand Rule, including the variables you would control and safety precautions you should take.

Answer: An experiment involves passing current through a straight wire placed in a magnetic field. The variables include current strength, magnetic field direction, and length of the wire. The force's direction on the wire is observed, confirming Fleming's Left Hand Rule. Safety precautions include ensuring the circuit is correctly wired, not exceeding safe current levels, and avoiding contact with live wires to prevent shocks.

Question 1: A straight conductor of length 1.5 meters in a magnetic field experiences a force of 0.45 N when a current of 2 A flows through it. Determine the magnetic flux density and explain how Fleming's Left Hand Rule helps predict the force's direction.

Answer: Using F = BIL, B = F / (I × L) = 0.45 N / (2 A × 1.5 m) = 0.15 T. Fleming's Left Hand Rule indicates that if the magnetic field and current directions are known, the force direction can be predicted accordingly, with the thumb pointing in the force direction when fingers are aligned with field and current.

Question 1: Explain how Fleming's Left Hand Rule is used in the working of electric motors.

Answer: Fleming's Left Hand Rule is used to determine the direction of force on the conductors within the motor. When current flows through the motor's coil in a magnetic field, the rule helps predict the rotation direction by relating the magnetic field, current, and force.

Question 2: Describe a day-to-day device that relies on Fleming's Left Hand Rule and briefly explain its operation.

Answer: Electric fans contain electric motors that operate based on Fleming's Left Hand Rule. When current passes through the motor windings in a magnetic field, the forces on the conductors cause the rotor to turn, producing motion to spin the fan blades.