Question

(i) What causes rusting of iron ? Design an activity to show the conditions needed for iron nails to rust. (ii) Why do we paint iron articles ? 24. (i) Twocircularcoils P and Q are kept close to each other, of which coil P carries a current. If coil P is moved towards Q, will some current be induced in coil Q ? Give reason for your answer and name the phenomenon involved. (ii) What happens if coil P is moved away from Q ? (iii) State any two methods of inducing current in a coil. 25. (i) With the help of an activity, explain the method of inducing electric current in a coil with a moving magnet. State the rule used to find the direction of electric current thus generated in the coil. (ii) Twocircularcoils P and Q are kept close to each other, of which coil P carries a current. What will you observe in Q ? (a) If current in the coil P is changed ?

Answer 1

Answer:

we paint iron article to protect from water

Answer 2

Answer:

The iron when comes in contact with air tends to develop rust. This is the reason that all iron objects are coated with paint so that the surface does not come in contact with air and do not develop rust on it. The rust formed on the iron is called as Ferric oxide and can bring down the durability of the material. So paint is the best way to avoid rust.