The northk and south poles of a bar magnet are situated 0.4 cm inside from the geometric ends of the magnet. If the geometric length of the magnet is 6 cm, then its effective length is ________ mm.

The northk and south poles of a bar magnet are situated 0.4 cm inside

1.	The northk and south poles of a bar magnet are situated 0.4 cm inside from the geometric ends of the magnet. If the geometric length of the magnet is 6 cm, then its effective length is ________ mm.
Answer» 48mm 52mm 56mm 54mm Solution :Geometrical length of the magnet =6 cm. THEREFORE, EFFECTIVE length of the magnet`=6-(2xx(0.4))` `=5.2 cm ` `=52mm`. Hence , the CORRECT OPTION is (B).