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The northk and south poles of a bar magn...

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.

A

48mm

B

52mm

C

56mm

D

54mm

Text Solution

Verified by Experts

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).
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