Question

The direction of force on a current carrying conductor in a magnetic field is given by

• A. Fleming's left-hand rule
• B. Newton's laws of motion
• C. Ohm's law
• D. Joule's law of heating

Hint:

Remember the orientation of the thumb, forefinger, and middle finger in Fleming's left-hand rule to determine the direction of force, magnetic field, and current, respectively.

Answer 1

The Correct Option is A

Step 1: Recall the interaction between magnetic fields and current-carrying conductors.
When a current-carrying conductor is placed in a magnetic field, it experiences a force. The direction of this force depends on the direction of the current and the direction of the magnetic field. Step 2: Analyze the given options. \begin{enumerate} \item Fleming's left-hand rule: This rule provides a way to determine the direction of the force on a current-carrying conductor placed in a magnetic field. If the thumb, forefinger, and middle finger of the left hand are held mutually perpendicular, with the forefinger pointing in the direction of the magnetic field and the middle finger pointing in the direction of the current, then the thumb will point in the direction of the force on the conductor. \item Newton's laws of motion: These laws describe the relationship between the motion of an object and the forces acting upon it. While force is involved, Newton's laws do not specifically give the direction of the magnetic force on a current-carrying conductor. \item Ohm's law: This law states the relationship between voltage, current, and resistance (\( V = IR \)) in an electrical circuit. It does not deal with the force experienced by a current-carrying conductor in a magnetic field. \item Joule's law of heating: This law describes the heat produced in a conductor due to the flow of electric current (\( H = I^2 Rt \)). It is related to energy dissipation, not the direction of the magnetic force. \end{enumerate} Step 3: Identify the rule that gives the direction of the force.
Fleming's left-hand rule is specifically designed to determine the direction of the force on a current-carrying conductor in a magnetic field.