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With a standard rectangular bar magnet the time period of a vibration magnetometer is 4 seconds. The bar magnet is cut parallel to its length into four equal pieces. The time period of vibration magnetometer when one piece is used (in seconds) (bar magnet breadth is small ) is

\[\begin {array} {1 1} (1)\;16 & \quad (2)\;8 \\ (3)\;4 & \quad (4)\;2 \end {array}\]

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(3) 4
answered Nov 7, 2013 by pady_1

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