A straight horizontal copper wire carries a current i = 30 A. The linear mass density of the wire is 45 g/m. What is the magnitude of the magnetic field needed to balance its weight?

A long wire carries a current of 90 A in the east to west direction. What is the magnitude and direction of magnetic field due to the current I.5m below the line?

A straight wire, of length L, carrying a current I, stays suspended horizontally in mid air in a region where there is a uniform magnetic field vecB . The linear mass density of the wire is lambda . Obtain the magnetic of this magnetic field.

What is the shape of the magnetic field lines around a current carrying straight wire?

A very long straight wire carries a current 5.2A. What is the magnitude of the magnetic field at a distance 3.1 cm from the wire?

A long straight wire carries a current of 35 A. What is the magnitude of the field B at a point 35 cm from the wire ?

A straight wire carrying a current 10 A is bent into a semicircular arc of radius 5 cm . The magnitude of magnetic field at the center is

A horizontal wire of length 0.5m carries a current of 5A . If the mass of the wire is 10mg , the minimum magnetic field required to support the weight of the wire is (g=10m//g^(2))

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 ?

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 ?