Magnetic Field Of A Short Dipole — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Magnetic Field of a Short Dipole This approximation is valid when the observation point is much farther away from the dipole than the dipole's size (r >> L). Assume the dipole can be replaced by a magnetic moment 'm' located at the origin. Use the Biot-Savart law or magnetic vector potential method for a dipole. Calculate the field component along the axis (B axis) and perpendicular to the axis (B equator) using vector geometry. The resulting field strength decreases rapidly with the cube of the distance (1/r 3). r > 0 The dipole length (L) must be much smaller than the distance r (r L). Confusing the field dependence with 1/r (which is characteristic of electric fields from point charges). Assuming the field is zero at the origin (the field is maximum at the origin). Ignoring the difference between the axial and equatorial field strengths (B axis = 2 B equator).