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Two short magnets have equal to pole str...

Two short magnets have equal to pole strength but one is twice as long as the other. The shorter magnet is placed 20 cm in tan A position from the compass needle. The longer magnet must be placed on the other side of the magnetometer for no deflection at a distance equal to:

A

`20(2) ^(1//3) cm`

B

`20(2)^(2//3)cm`

C

`40 cm`

D

`20 cm`

Text Solution

Verified by Experts

`(M_(1))/(d_(1)^(3))= (M_(2))/(d _(2) ^(3))and M _(2) = 2 M _(1)`
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