The direction of magnetic field lines in a region outside the bar magnet is $.....$

$A$ student,while studying the force experienced by a current-carrying conductor in a magnetic field,records the following observations:
$(i)$ The force experienced by the conductor increases as the current is increased.
$(ii)$ The force experienced by the conductor decreases as the strength of the magnetic field is increased.
Which of the two observations is correct and why?

Who first observed that a current-carrying wire experiences a force when placed in a strong magnetic field?

On what factors does the force experienced by a current-carrying conductor placed in a uniform magnetic field depend?

The magnitude of an $AC$ voltage used in India is $......$ and its frequency is $......$.

$A$ 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.