Which is the direction of magnetic force acting on a current-carrying wire placed in a magnetic field?

Whose magnetic field is like a magnetic field of a bar magnet?

$A$ student performs an experiment to study the magnetic effect of current around a current-carrying straight conductor. He reports that:
$(i)$ The direction of deflection of the north pole of a compass needle kept at a given point near the conductor remains unaffected even when the terminals of the battery sending current in the wire are interchanged.
$(ii)$ For a given battery,the degree of deflection of a $N$-pole decreases when the compass is kept at a point farther away from the conductor.
Which of the above observations of the student is incorrect and why?

$(a)$ Name the type of electric current generated by most of the power stations in our country.
$(b)$ Why is it preferred over the other type?
$(c)$ State the frequency of the power supply generated in India.

The direction of the magnetic force acting on a current-carrying wire placed in a strong magnetic field can be determined by which rule?

What is meant by electromagnetic induction? State the rule which helps in determining the direction of induced current.