Question 4 - Past Year - 3 Mark Questions - Chapter 13 Class 10 - Magnetic Effects of Electric Current

Give reasons for the following:

(i) There is either a convergence or a divergence of magnetic field lines near the ends of a current carrying straight solenoid. 

(ii) The current carrying solenoid when suspended freely rest along a particular direction. 

(iii) The burnt out fuse should be replaced by another fuse of identical rating.

Answer:

(i)

There is either a convergence or a divergence of magnetic field lines near the ends of a current carrying straight solenoid because magnetic field is stronger near the ends of the solenoid.

(ii)

A current carrying solenoid behaves like a magnet.

So, when it is suspended freely it will align itself in the north-south direction.

(iii)

A Burnt out fuse cannot be reused. Also, a fuse wire works because of its lower melting point. If the fuse with larger rating is used with an appliance,  the fuse wire shall not melt and hence would fail to serve the required purpose. So, a new fuse of the same rating should be used for electrical safety.