Two solenoids, 'P' and 'Q' are taken. The coil in solenoid 'P' is wound over a wooden cylindrical core and the coil in solenoid 'Q' is wound over a soft iron core. In which solenoid is the magentic field stronger.

By inserting a soft iron piece into a solenoid, the strength of the magnetic field

What is the effect of inserting a soft iron core inside a current-carrying solenoid?

A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid :

A tightly- wound, long solenoid is kept with its axis parallel to a large metal sheet carrying a surface current. The surgace current through a width dl of the sheet is Kdl and the number of turns per unit length of the solenoid is n. The magnetic field near the centre of the solenoid is found to be zero. (a) find the current in the solenoid. (b) If the solenoid is rotated to make its axis perpendicular to the metal sheet, what would be the magnitude of the magnetic field near its centre?

Which of the following is true regarding solenoid ? (A) strength of the magnetic field is independent of the material on which the coil is wound. (B) when the coil is wound around a soft iron core, it behaves like a temporary magnet.