Question

Write one application of each of the following;
Right-hand thumb rule.
Fleming’s left-hand rule.
Fleming’s right-hand rule

Answer 1

Hint: Thumb rules are usually used for determining the direction of some physical quantities in physics. We have different thumb rules for different situations. The determination of the directions of the magnetic field, current, force, angular momentum, torque, etc. can be easily done by using such rules.

Complete step by step solution:
The right-hand thumb rules can be used to determine the direction of the magnetic field and the direction of current flowing through the conductor.
Fleming’s left-hand rule can be used to determine the direction of the force or the direction of motion of the conductor of an electric motor when we already know the direction of the magnetic field and the direction of the current.
Fleming’s right-hand rule can be used to determine the direction of the current induced when a current-carrying conductor moves in a magnetic field.

Additional information
The right-hand thumb rule states that if the closed fingers of our hand represent the direction of the current flowing in a circular direction, then the direction towards which our thumb points will represent the direction of the magnetic field.
Fleming’s left-hand rule states that if we hold the thumb, index finger, and the middle finger of our left hand mutually perpendicular, the thumb will be representing the direction of the force on the conductor, the index finger will be representing the direction of the magnetic field and the middle finger will represent the direction of the current.
According to Fleming’s right-hand rule if we hold the thumb, index finger, and middle finger of our right hand mutually perpendicular, the thumb will be pointed towards the motion of the conductor in a magnetic field. The index finger will represent the direction of the magnetic field and the middle finger will give the direction of the current induced within the conductor.

Note:
These rules can be used only to determine the direction of the quantities. It cannot be used to determine the magnitude of the quantities. Also, these rules can be applied only if we know the direction of any two out of the three parameters.