A straight wire of length 30 cm and mass 60 mg lies in a direction `30^(@)` east of north.The earth's magnetic field at this is horizontal and has a magnitude of 0.8 G.What current must bre passed through the wire,so that it may float in air ?

Magnetic field at a distance 2.4 cm from a long straight wire is 16muT . What must be current through the wire?

A very long wire is held vertical in a direction perpendicular to the horizontal component of Earth's magnetic field. Find the value of current to be passed through this wire so that this resultant magnetic field at a point 10 cm away from this wire becomes zero. What will be the magnetic induction at a point 10 cm away from the wire on the opposite side of this point ? Horizontal component of Earth's magnetic field H=0.36xx10^(-4)T,mu_(0)=4pixx10^(-7)Tm//A .

A current of 10A is flowing east to west in a long wire kept in the east-west direction. Find magnetic field in a horizontal plane at a distance of 10cm north.

A straight wire of mass 400 g and length 2m carries a current of 2A. It is suspended in mid air by a uniform horizontal field B. What is the magnitude of the magnetic field ?