(i) When a current pass through solenoid, it creates a nearly uniform magnetic field inside or along the axis of the solenoid. Outside the coil or solenoid, i.e., at the ends and beyond the magnetic field is small and appears to diverge. This divergence is because the distance from the current carrying solenoid increases.
The distance from the current carrying conductor and the magnetic field are inversely proportional. That is, as distance increases, magnetic field strength decreases.
(ii) The current carrying solenoid when suspended freely rests along a particular direction because it behaves like a bar magnet.
(iii) Fuse is the most important safety device, used for protecting the circuits due to short-circuiting or overloading of the circuits. A fuse wire works because of its lower melting point which is possible. If a fuse with larger rating is used with an appliance, the fuse wire shall not melt and hence would fail to serve the required purpose.