Fleming's left hand rule gives the relation between:

Explanation:

Fleming's Left Hand Rule

Definition: Fleming's Left Hand Rule is a mnemonic used for understanding the direction of force exerted on a current-carrying conductor in a magnetic field. It helps in determining the direction of the force when the direction of the magnetic field and the direction of the current are known.

Working Principle: According to Fleming's Left Hand Rule, if you align your left hand such that the thumb, forefinger, and middle finger are mutually perpendicular to each other:

• The Thumb represents the direction of the Force (or motion) experienced by the conductor.
• The Forefinger represents the direction of the Magnetic Field.
• The Middle Finger represents the direction of the Current flowing through the conductor.

This rule is particularly useful in the context of electric motors, where it helps to determine the direction of motion of the motor's armature.

Applications:

• Electric Motors: Fleming's Left Hand Rule is used to determine the direction of force in electric motors, which is essential for the rotation of the motor's armature.
• Generators: In generators, it helps in understanding the induced current direction when the motion and magnetic field direction are known.

Correct Option Analysis:

The correct option is:

Option 3: Direction of force, direction of current and direction of flux.

This option correctly describes the parameters involved in Fleming's Left Hand Rule. The rule specifically deals with the relationship between the direction of force (or motion), the direction of current, and the direction of the magnetic field (flux).

Important Information

To further understand the analysis, let’s evaluate the other options:

Option 1: Voltage, current, and resistance.

This option is incorrect because Fleming's Left Hand Rule does not deal with the relationship between voltage, current, and resistance. These parameters are related through Ohm's Law, which states that Voltage (V) = Current (I) * Resistance (R).

Option 2: Voltage, current, and power.

This option is also incorrect as Fleming's Left Hand Rule does not concern itself with voltage, current, and power. The relationship between these parameters is given by the formula Power (P) = Voltage (V) * Current (I).

Option 4: Direction of power, direction of current, and direction of voltage.

This option is incorrect because power is not a directional quantity in the same context as force, current, and magnetic field. Fleming's Left Hand Rule does not relate to the direction of power or voltage.

Conclusion:

Understanding Fleming's Left Hand Rule is crucial for determining the direction of force in electromagnetic systems, especially in electric motors and generators. The rule specifically involves the direction of force, the direction of current, and the direction of the magnetic field, making Option 3 the correct choice. It is distinct from concepts involving voltage, resistance, and power, which are governed by different principles and laws in electrical engineering.