The magnetic field produced by a current in a straight wire has no poles.

The direction of induced potential difference (induced current) is given by:

What is the role of a fuse used in series with an electrical appliance? Why should a fuse with a defined rating not be replaced by one with a larger rating?

$A$ 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?

Fleming's right-hand rule can be used to find the direction of the magnetic field.

$A$ soft iron bar is introduced inside a current-carrying solenoid. The magnetic field inside the solenoid: