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?

An air-core solenoid having N turns and length l is carrying a current I ampere Sketch the pattern of magnetic lines of force in the solenoid.

An air coil solenoid is connected to an a.c. sources and a bulb. If an iron core is insernted in the solenoid, how does the brightness of the bulb change? Give reason for your answer.

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 rectangular loop of area A, having N turns and carrying a current of I ampere is held in a uniform magnetic field B. Write down the expression for the maximum torque experiened by the loop.

A long solenoid has 1000 turns per metre and carries a curent of 1A. It has a soft iron of mu_1 =1000 . The core is heated beyond the Curie temperature T_c .

A solenoid of length 'l' having n turns carries current 'I'. Deduce the expression for the magnetic field in the interrior of the solenoid.

A solenoid of length 50cm, having 100 turns carries a current of 2.5A. Find the magnetic field in the interior of the solenoid.

A long solenoid has n turns per unit length and radius a. A current I = I _ 0 sin omega t flows through it. A cylindrical vessel of radius R, length L, thickness d (d lt lt R) and resistivity rho is kept coaxially shown int he figure. Find the induced current in the outer cylindrical vessel.