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

To find the direction of the magnetic field around a current-carrying conductor,we use Fleming's left-hand rule.

How does the strength of the magnetic field at the centre of a circular coil of wire depend on: $(i)$ the radius of the coil $(ii)$ the number of turns of wire in the coil $(iii)$ the strength of the current flowing in the coil?

$(a)$ What are magnetic field lines? How is the direction of a magnetic field at a point determined?
$(b)$ Draw two field lines around a bar magnet along its length on its two sides and mark the field directions on them by arrow marks.
$(c)$ List any three properties of magnetic field lines.

How does a current-carrying solenoid behave?

Write any one method to induce current in a coil.