Anjali asks the following tasks to be performed by students of Class VII while making an electromagnet (not in correct sequence).
1. Place some pins near the end of a nail.
2. Switch on the current and observe what happens.
3. Wind a copper wire lightly around an iron nail.
4. Connect free end of the wire to the terminals of cell.
Which one of following is the correct sequence of task to be performed to achieve the desired result?

Options

A. 1,2,3 and 4
B. 3, 4, 1 and 2
C. 3, 1, 2 and 4
D. 4, 2, 3 and 1

Answer

B

Explanation

An electromagnet works in the magnetic effect of current. This is described below
(i) Wind a copper wire tightly around an iron nail.
(ii) Connect free ends of the wire to the terminals of a cell.
(iii) Place some plns near the end of a nail.
(iv) A current passes through he coll and produces a magnetic effect.