Question

Fill in the blanks: Fleming’s left-hand rule is used to find the direction of _____ acting on the current carrying conductor placed in a/an _____ field.
A. Force, Magnetic
B. Force, Electric
C. Torque, Magnetic
D. Torque, Electric

Answer 1

Hint
A current carrying conductor tends to induce a magnetic field around it, due to the movement of molecules. This magnetic field varies with the direction of the flow of current in the conductor.

Complete step by step answer
We know that current-carrying conductors and magnetic fields are closely related. Both of these exert forces on each other under a magnetic or electric field’s influence. We are also aware that the force is a vector quantity, which means it has both a magnitude and a direction.
We can find both of these parameters for a force by analysing the direction of its constituent components, but to readily check the direction of force, Fleming’s left-hand rule is used.
When a current carrying conductor is placed inside a magnetic field, a force is exerted on the conductor. This force has a direction perpendicular to both the directions of the current and the magnetic field, which is easily visualised by using Fleming’s left hand rule.
Hence, to answer our question, this rule is used to find the direction of force acting on a current carrying conductor placed in a magnetic field: option A.

Note
The rule uses the fingers and the thumb of our left hand to find the direction of any of the three quantities. The direction of current is specified by the middle finger, while the direction of the magnetic field is denoted by the fore finger, and the thumb represents the direction of the force acting on the conductor.