Draw a diagram to represent the magnetic field lines along the axis of a current carrying solenoid mark arrows to show the direction of current in the solenoid and the direction of magnetic field lines.

The adjacent diagram shows a small magnet placed near a solenoid $AB$ with its north pole $N$ near the end $A$. Current is switched on in the solenoid by pressing the key $K.$ State the polarity at the ends $A$ and $B.$ Give a reason for your answer.

The adjacent diagram shows a small magnet placed near a solenoid $AB$ with its north pole $N$ near the end $A$. Current is switched on in the solenoid by pressing the key $K.$ Will the magnet be attracted or repelled ? Give a reason for your answer.

The following diagram shows a spiral coil wound on a hollow cardboard tube AB. A magnetic compass is placed close to it. Current it switched on by closing the key. (a) What will be the polarity at the ends A and B?

(b) How will the compass needle be affected? Give reason.