What is the force on a wire of length 4.0 cm placed inside a solenoid near its centre, making an angle `30^@` with its axis? The wire carries a current of 12 A and the magnetic field due to the solenoid has a magntiude of 0.25 T.

A circular coil of 50 turns and radius 0.2 cm carries a current of 12 A. Find magnetic field at the centre of the coil.

A bar of diamagnetic material is placed in a magnetic field with its length making an angle of 30^@ with the direction of the magnetic field. How will the bar behave?

A solenoid of length 1 m and 3 cm in diameter has five layers of winding of 850 turns each and carries a current of 5 A. What is the magnetic field thorugh a cross-sectional end of the solenoid of the solenoid at its centre.

What is the magnitude of magnetic force per unit length on a wire carrying a current of 8 A and making an angle of 30^@ with the direction of a uniform magnetic field of 0.15 T?

The magnetic field at a distance r from a long wire carryimg current I is 0.4 T. The magnetic field at a distance 2r is

A 3.0 cm wire carrying a current of 10 A is placed inside a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be 0.27 T. What is the magnetic force on the wire?

A solenoid 60 cm long and of radius 4.0 cm has 3 layers of windings of 300 turns each. A 2.0 cm long wire of mass 2.5 g lies inside the solenoid (near its centre) normal to its axis, both the wire and the axis of the solenoid are in the horizontal plane. The wire is connected through two leads parallel to the axis of the solenoid to an external battery which supplies a current of 6.0 A in the wire. What value of current (with appropriate sense of circulation) in the windings of the solenoid can support the weight of the wire? g = 9.8 m s^-2 .