Draw the pattern of field lines due to a solenoid carrying electric current. What does the magnetic field pattern inside the solenoid indicate.
How can this principle be utilised to make an electromagnet? State two ways by which strength of an electromagnet can be increased?

Draw the pattern of magnetic field lines around a current carrying straight conductor.How does the strength of magnetic field produce change with an increase in current in a conductor?

What does the divergence of magnetic field lines near the ends of a current carrying straight solenoid indicate?

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?

An electron is moving with velocity vecv along the axis of a long straight solenoid carrying current 'I'. What will be the force acting on the electron due to the magnetic field of the solenoid?

State the Biot-Savart's law for the magnetic field due to a current carrying element. Use this law to obtain a formula for magnetic field at athe centre of circular loop of radius r carrying steady current I . Sketch the magnetic field lines for a current loop clearly indicating the direction of the field.

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 .