In an electric motor,the direction of current in the loop reverses after every $........$ rotation.

How is a current-carrying wire placed in a magnetic field so that the magnetic field does not act on it?

$A$ magnetic compass shows a deflection when placed near a current-carrying wire. How will the deflection of the compass be affected if the current in the wire is increased? Support your answer with a reason.

How is the relative strength of a magnetic field shown around a magnet?

Why does a current-carrying conductor kept in a magnetic field experience a force? On what factors does the direction of this force depend? Name and state the rule used for the determination of the direction of this force.

Choose the incorrect statement from the following regarding magnetic field lines.