By increasing the number of turns $3$ times in a toroidal solenoid,the magnetic field:

State the condition for electromagnetic induction to take place. $A$ cylindrical bar magnet is kept along the axis of a circular coil as shown in the figure. Will there be a current induced in the coil if the magnet is rotated about its axis? Discuss.

Write one difference between direct current $(DC)$ and alternating current $(AC)$. Which one of the two is mostly produced at power stations in our country? Name one device which provides alternating current. State one important advantage of using alternating current.

In an electric circuit,a fuse is used because $......$

Why does a current-carrying conductor experience a force when it is placed in a magnetic field? State Fleming's left-hand rule.

Choose the incorrect statement.