Question

A bar magnet of pole strength $20A.m$. is divided into $4$ equal parts by slicing it along lines parallel to length and breadth, passing through center. The pole strength of each piece is ________ $A.m$.

• A. $80$
• B. $10$
• C. $20$
• D. $40$

Answer 1

The correct option is B $10$

Pole strength is affected only when cut along the axial line .
$m/2$ when cut along the axial line and remains same when cut along the equatorial line