[" (8) "4" vibration magnetometer placed in magnetie "],[" meridian has a small bar magnet.The magnet "],[" executes oseillations with a time period of "2" s in "],[" earth's horizontal magnetie field of "24" microtesta,"],[" When a horizontal fleld of "18" microtesta is "],[" produced opposite to the oarth's field by placing a "],[" current carrying wire,the new time period of "],[" magnet will be: "]