Q. 8

A magnetic dipole of magnetic moment 1.44 A m2 is placed horizontally with the north pole pointing towards north. Find the position of the neutral point if the horizontal component of the earth’s magnetic field is 18 μT.

Answer :



We know for a magnetic dipole with its pole pointing to the north, neutral point always lies in the broadside-on position.

let d be the perpendicular distance of the neutral point from midpoint of the magnet

the magnetic field due to the dipole at the broadside-on position(B) is given by

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The force on a north pole, is parallel to the field . Does it contradict our earlier knowledge that a magnetic field can expert forces only perpendicular to itself.

HC Verma - Concepts of Physics Part 2