A constant current is passed through, a solenoid. If a iron rod is inserted along the axis of the solenoid, If a iron rod is inserted along the axis of the solenoid, which of the following quantities will increases?

An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true?

A solenoid is connected to a battery so that a steady current flows through it. If an iron core is inserted into the solenoid, will the current increase or decrease ? Explain.

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 .

The current through a solenoid increases at a constant rate, then induced current:

Using Ampere's circuital law, derive an expression for the magnetic field along the axis of a toroidal solenoid.

A long solenoid carrying a current produces a magnetic field B along its axis. If the number of turns per cm is doubled and the current in the solenoid is halved, then the new value of the magnetic field along its axis will be

An air-core solenoid having N turns and length l is carrying a current I ampere . If an iron core is inserted in it, how is its field modified?

Find the equation of an ellipse whose major axis is along the y-axis and which passes through the points (2,2) and (1,4).

Consider a metal rign kept on top of fixed solenoid carrying a current as shown in the figure . The centre of the ring coincides with the axis of the solenoid. If the current is suddenly switched off, what will happen to the ring?