Make four electromagnets with 20, 40, 60 and 80 turns. Connect them one by one to a battery of 2 cells. Bring the electromagnet near a box of pins. Count the number of pins attracted by it. Compare the strengths of the electromagnets.
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"Consider four electromagnets as given in the question where A is of 20 turns; B is of 40 turns; C is of 60 turns; and D is of 80 turns. If the four electromagnets in the question are connected as given to a battery with two cells one by one.
If the four electromagnets given in the question are present closer to the box of pins.
The electromagnet D will attract more number of pins; followed by the electromagnet C; followed by the electromagnet B and finally the electromagnet A will entice minimum number of pins.
The reason is because the strength of the electromagnet increases by increasing in number of turns.
So, the strength of the electromagnets in the decreasing order with respect to number of turns is given by D>C>B>A."
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