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

Answer: Fleming's Left Hand Rule is a mnemonic to predict the direction of force on a current-carrying conductor in a magnetic field, indicating that the thumb represents force, the first finger the magnetic field, and the second finger the current. It is significant because it helps determine the motion of conductors in motors.

Question 2: Describe the three directions represented by the thumb, the first finger, and the second finger in Fleming's Left Hand Rule.

Answer: The thumb indicates the direction of the force (motion), the first finger indicates the magnetic field, and the second finger indicates the current direction.

Question 3: Why is Fleming's Left Hand Rule important in designing electric motors?

Answer: It helps in predicting the direction of force and motion, enabling engineers to design motors that produce rotation in desired directions.

Question 1: A straight conductor of length 0.5 metres carries a current of 3 amperes in a magnetic field of flux density 0.2 teslas. Calculate the force acting on the conductor using the formula F = BIL sinθ. Assume θ = 90° for maximum force.

Answer: F = 0.2 T × 3 A × 0.5 m × sin(90°) = 0.2 × 3 × 0.5 × 1 = 0.3 N

Question 2: If the magnetic flux density is doubled to 0.4 T, what is the new force on the same conductor carrying the same current and length?

Answer: F = 0.4 T × 3 A × 0.5 m × sin(90°) = 0.4 × 3 × 0.5 × 1 = 0.6 N

Question 1: Describe a typical experiment to demonstrate Fleming's Left Hand Rule. Include the key variables that need to be controlled.

Answer: An experiment involves a current-carrying conductor placed in a magnetic field, with the current direction, magnetic field, and conductor length as variables. The conductor is free to move, and the force is observed. Variables to control include current magnitude, magnetic field strength, and conductor length. Safety precautions include ensuring the circuit is off before adjusting connections and avoiding contact with moving parts.

Question 2: List two safety precautions that should be taken when conducting experiments involving magnetic forces and electric currents.

Answer: Ensure the power supply is turned off before making adjustments, and avoid contact with moving conductors to prevent injury.

Question 1: A copper wire 1 metre long is placed in a magnetic field of 0.3 T, with a current of 2 A flowing through it. The wire experiences a force of 0.6 N. Verify whether this data is consistent with the formula F = BIL sinθ, assuming θ = 90°. Show your working.

Answer: Using F = BIL sinθ, F = 0.3 T × 2 A × 1 m × sin(90°) = 0.3 × 2 × 1 × 1 = 0.6 N. The data is consistent with the formula.

Question 1: Explain how Fleming's Left Hand Rule is used in the design of electric motors in industry. Provide an example of a device or application.

Answer: Fleming's Left Hand Rule helps engineers determine the direction of force and motion on conductors within electric motors. For example, in household appliances like washing machines, the rule guides the design of the motor's coil placement and current direction to ensure the rotor spins in the desired direction, enabling efficient operation.