Which of the following rules is used to determine the direction of the force acting on a straight current-carrying conductor placed in an external magnetic field ?
Fleming’s Left-Hand Rule
A current-carrying conductor placed in a magnetic field experiences a force (the motor effect). Its direction is perpendicular to both the current and the field.
Fleming’s Left-Hand Rule gives this direction: stretch the thumb, forefinger and middle finger of the left hand mutually perpendicular; the forefinger points along the field, the middle finger along the current, and the thumb then points along the force on the conductor. This is the rule used in the working of electric motors.
The Right-Hand Thumb Rule gives the direction of the magnetic field lines around a current-carrying wire, not the force on it. Ampère’s Circuital Law relates the magnetic field around a closed loop to the current enclosed and is used to calculate field strength. The Right-Hand Palm Rule is not the rule prescribed for the motor effect in the standard school treatment of magnetic effects of current; that role belongs to Fleming’s Left-Hand Rule. A listed rule does the job, so “None of the above” does not apply.
Fleming’s Left-Hand Rule option is correct.
Important Questions from Magnetism
The magnet used to lift and transport heavy loads like big metals, steel girders and scrap iron objects for loading and unloading purposes is known as____.
A suspended bar magnet is rotated. It will come to rest in the north-south direction. This shows that the earth has its own_______.
When a bar magnet is cut into two equal parts, then:
Consider the following statements about a magnetic field.
(i) A magnetic field has both magnitude and direction.
(ii) The direction of magnetic field lines inside a bar magnet is from its south pole to its north pole.
(iii) Magnetic field lines are closed curves.
Select the correct option.
What will happen if a collection of positive and negative charges are passed at a high speed through a magnetic field which is perpendicular to the direction of motion of the charges? (Assume that both kind of charges are NOT going to recombine)
