In which of the following devices is an electric motor $NOT$ used?

Draw a diagram to show how a magnetic needle deflects when it is placed above or below a straight conductor carrying current,depending on the direction of the current in the conductor.

Choose the incorrect statement.

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

For the circular coil carrying current shown alongside,draw magnetic field lines. Decide which of its face behaves as North Pole and which face as South Pole. Give reason to justify your answer.

Which instrument is used to know the presence of an electric current in a circuit?