MAHE Manipal B.Sc Nursing 2025
ApplyAccorded Institution of Eminence by MoE, Govt. of India | NAAC A++ Grade | Ranked #4 India by NIRF 2024
Magnetic force on a current carrying conductor is considered one of the most asked concept.
16 Questions around this concept.
If the current is flowing clockwise in a circular coil, the direction of magnetic lines of force inside the coil is
The magnetic induction at the centre O in Fig shown is
The current is flowing in south direction along a power line. The direction of magnetic field above the power line (neglecting earth's field) is
Magnetic force on a current carrying conductor -
In case of current carrying conductor in a magnetic field force experienced by its small length element is
For total force, we will integrate the above equation. So the total magnetic force -
If magnetic field is uniform i.e.,
Then,
Direction of force -
The direction of force is perpendicular to both the length and magnetic field vector as we have discussed earlier that the result of the cross product of two vector have direction perpendicular to both the vectors. It can be find by right hand palm rule, screw rule, right hand thumb rule etc. Here we will discuss one important rule for this i.e., Fleming’s left-hand rule.
According to Fleming’s left-hand rule - Stretch the fore-finger, central finger and thumb left hand mutually perpendicular. Then if the fore-finger points in the direction of field
Note - If curved wire is given in the question then the length will be taken as shown in the figure -
And the direction of the length vector should be in the direction of current.
"Stay in the loop. Receive exam news, study resources, and expert advice!"