Mention the angle between a current-carrying conductor and a magnetic field for which the force experienced by this conductor is maximum. (in $^{\circ}$)

How can you show that the magnetic field produced by a given electric current in a wire decreases as the distance from the wire increases?

With the help of a neat diagram,describe how you can generate induced current in a circuit.

$A$ uniform magnetic field is directed vertically upwards. In which direction should an $\alpha$-particle (which is a positively charged particle) be projected in this field so that it is deflected southwards? Name and state the rule used to find the direction in this case.

In the diagrams shown below:
$(i)$ Name the type of current in two cases.
$(ii)$ Identify any one source for each type of these currents.
$(iii)$ What is the frequency of current in case $(ii)$ in India?
$(iv)$ Use above graphs to write two differences between the current in two cases.

Which scientist discovered that an electric current can be produced using a magnetic field?